lawn-care-schedule

name	lawn-care-schedule
description	Creates a seasonal lawn care schedule covering fertilization timing, aeration, overseeding, mowing height, and watering by grass type and climate region. Produces a month-by-month maintenance calendar with specific tasks and timing. Use when the user asks about lawn care timing, fertilizer schedules, when to aerate or overseed, mowing height for their grass type, or seasonal lawn maintenance tasks. Do NOT use for garden planning (use vegetable-garden-planning), landscape design, weed identification, or commercial turf management.
license	Apache-2.0
metadata	{"author":"foundry-skills","version":"1.0.0","tags":"gardening checklist planning","category":"home-household","subcategory":"gardening","depends":"","disclaimer":"none","difficulty":"beginner"}

Lawn Care Schedule

When to Use

Use this skill when:

• User asks when to fertilize their lawn and how many times per year, or which season is most important for feeding their grass type
• User wants a month-by-month or season-by-season lawn care calendar tailored to their grass species and climate zone
• User asks when to aerate, whether to use core aeration or spike aeration, or how to know if their lawn needs aeration
• User asks about overseeding timing, seeding rates, or how to thicken a thin or patchy lawn
• User asks about mowing height, mowing frequency, or the "right" time to raise or lower the deck
• User wants to understand a watering schedule -- how much, how often, and what time of day
• User asks about dethatching timing, thatch thickness thresholds, or whether to dethatch before overseeding
• User wants to know what lawn care tasks to do "this month" given their location and grass type
• User asks about winterizing their lawn or preparing it for spring green-up
• User is experiencing summer dormancy browning and wants to know how to manage it

Do NOT use when:

• User wants vegetable garden planning, crop rotation, or planting schedules (use vegetable-garden-planning)
• User needs landscape design, hardscaping layout, or plant selection for beds and borders
• User wants to identify a weed or select a specific herbicide product for spot treatment or broadleaf control
• User is managing a commercial sports turf, golf course fairway, or athletic field with professional-grade equipment
• User wants to install a new lawn from scratch on bare soil -- sod installation, hydroseeding, and seedbed preparation are separate topics requiring grade work, soil amendment, and establishment protocols beyond this skill
• User is asking about lawn disease diagnosis -- fungal patch identification, dollar spot, brown patch, and pythium require a separate diagnostic skill
• User is asking about pest identification -- grubs, chinch bugs, armyworms, and mole crickets are a separate topic
• User wants a full soil amendment plan based on soil test results -- interpreting a complete soil test report with lime rates, sulfur applications, and micronutrient corrections is beyond this skill's scope

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Process

Step 1: Determine Grass Type and Climate Zone

Before producing any calendar, classify the user's lawn into one of three categories. Every task, every timing window, and every product rate in this skill depends on this classification. Do not skip this step.

• Ask directly if unknown: "Do you know what type of grass you have? If not, does your lawn go brown and dormant in winter (warm-season) or stay green into late fall and green up early in spring (cool-season)?"
• Ask for the user's location (state, city, or USDA hardiness zone) to determine the relevant climate region
• If the user is in a transition zone state (Virginia, North Carolina, Tennessee, Arkansas, Kansas, Missouri, Kentucky, northern Georgia, northern Alabama), ask which grass type they have planted -- the zone itself does not determine the care schedule

Grass type classification reference:

Category	Common Grasses	Optimal Growth Temp	Primary Growing Season	Geographic Range
Cool-season	Kentucky bluegrass, tall fescue, perennial ryegrass, fine fescue, creeping bentgrass	60--75°F	Spring (March--May) and fall (September--November)	USDA Zones 3--6; transition zone with cool-season selection
Warm-season	Bermuda, zoysia, St. Augustine, centipede, bahia, buffalo grass	80--95°F	Late spring through summer (May--September)	USDA Zones 7--10; transition zone with warm-season selection
Transition zone hybrids	Tall fescue (most common), Kentucky 31 fescue, certain zoysia cultivars	Varies	Depends on species	Zone 6--7 belt

Soil temperature lookup: Soil temperature drives every biological process in a lawn -- germination, root growth, and fertilizer uptake. Soil temp at 2-inch depth is the number to use. Approximate seasonal soil temp milestones by zone:

Event	Soil Temp Threshold	Zone 5 Timing	Zone 7 Timing	Zone 9 Timing
Crabgrass germination begins	55°F for 3+ consecutive days	Mid-April	Early March	Late January
Cool-season seed germinates	50--65°F	Mid-September	Early October	November
Warm-season green-up begins	65°F	N/A	Mid-April	Early March
Warm-season fertilize window opens	70°F soil	N/A	Late April	Early March

If the user does not have a soil thermometer, use the forsythia phenological cue: forsythia blooms when soil is approximately 55°F. Redbud bloom coincides with roughly 60--65°F soil temperature.

---

Step 2: Build the 12-Month Maintenance Calendar

Assign specific tasks to each month based on the grass type and zone determined in Step 1. The calendar below covers both grass categories -- use only the relevant one.

Cool-season grass monthly framework (Zone 5 baseline -- adjust ±2--4 weeks for other zones):

Month	Tasks	Key Decision Points
March	Remove winter debris; inspect for snow mold (pink or gray mycelium patches); sharpen mower blades	If snow mold is severe, lightly rake affected areas to allow drying
April	First mow when grass exceeds target height by 50%; apply pre-emergent if NOT overseeding in fall	Soil temp watch: pre-emergent goes down at 55°F; do NOT apply if you plan to overseed the same year
May	Begin fertilization (first application); establish mowing rhythm; supplement rainfall if below 1 inch/week	Use slow-release nitrogen; bagging vs. mulching decision starts here
June	Raise mower deck to summer height; shift watering to early morning deep cycles	Transition to 2x/week watering if temperatures exceed 85°F regularly
July	High mow, deep water; accept light dormancy if water-restricted; do NOT fertilize dormant grass	Footprint test: if footprints stay visible 30+ seconds, water now
August	Plan fall work; order overseeding seed now; schedule aerator rental	Seed selection: 95%+ germination rate on label; check blend vs. straight variety
September	Core aerate (highest-priority month); overseed immediately after aeration; fertilize (most critical application of the year)	Do not apply pre-emergent if overseeding; keep seed moist daily until germination
October	Second fall fertilizer; continue mowing until growth stops; rake leaves promptly (smothered grass develops disease)	Overseed establishment check -- young seedlings need one more application of starter fertilizer if thin
November	Winterizer fertilizer (after growth slows but before ground freeze); final mow; clear leaves	Lower final mow height to 2.5--3 inches to prevent snow mold tunneling
December	No active tasks; avoid traffic on frozen crowns	Equipment winterization: drain fuel stabilizer, store mower blades
January	Planning month: order seed, schedule soil test, inventory fertilizer	Soil test results take 2--3 weeks; request from local extension office
February	Sharpen blades; service mower; watch for early green-up in southern zones	Do not rush first mow -- wait until grass is genuinely growing, not just thawing

Warm-season grass monthly framework (Zone 8 baseline -- adjust ±2--4 weeks):

Month	Tasks	Key Decision Points
January--February	No fertilization; dormant irrigation only if soil is very dry; mow if bermuda has winter ryegrass overseeded	Overseeded ryegrass needs 0.75--1 inch/week watering during dormancy period
March	Monitor for green-up (bermuda: soil hits 65°F); pre-emergent application before 55°F soil	Do NOT fertilize warm-season grass before 50% green-up -- cold-forced nitrogen burns stored carbohydrates
April	Green-up begins most of Zone 8; first fertilizer 2--4 weeks after confirmed green-up; begin mowing	Scalp the lawn once at green-up to remove dead material and stimulate lateral growth
May	Regular mowing rhythm; second fertilizer application; dethatch if thatch exceeds 0.5 inch	Dethatching timing: only when grass is growing vigorously; never dethatch during heat stress
June	Peak growth -- mow more frequently; fertilize bermuda and St. Augustine; monitor for chinch bugs	Bermuda in peak growth needs mowing every 3--5 days to maintain 1.5-inch height
July	Continue summer fertilization; deep water 1--1.5 inches/week; watch for heat/drought stress	Avoid fertilizing centipede in July -- it causes thatch buildup and nitrogen burn
August	Last fertilizer application 6--8 weeks before expected first frost; aerate if soil is compacted	Warm-season aeration: best done now while grass can recover before dormancy
September	Reduce fertilization to zero by mid-September; continue mowing; overseed with perennial ryegrass for winter color (optional)	Ryegrass overseeding: scalp to 0.5 inch, seed at 5--10 lbs/1,000 sqft, keep moist 14 days
October	Grass slows; reduce watering; mow as needed	Watch for first frost date -- bermuda goes dormant after first hard frost
November	Dormancy begins; no nitrogen; reduce or eliminate irrigation	Potassium application (0-0-30 or similar) in early fall improves cold hardiness
December	Full dormancy; no irrigation unless extreme drought	Brown color is normal and expected -- do not fertilize to "green it up"

---

Step 3: Set Mowing Height and Frequency

Mowing height is the most controllable variable in a home lawn program and has the largest single effect on lawn health, weed pressure, and drought tolerance.

Mowing height by grass species:

Grass Species	Optimal Height Range	Minimum Acceptable Height	Summer Height Adjustment	Mowing Frequency (active growth)
Kentucky bluegrass	2.5--3.5 inches	2 inches	Raise to 3.5--4 inches	Every 5--7 days
Tall fescue	3--4 inches	2.5 inches	Raise to 4--4.5 inches	Every 7--10 days
Perennial ryegrass	2--3 inches	1.5 inches	Raise to 3 inches	Every 5--7 days
Fine fescue (creeping red, chewings, hard)	2.5--4 inches	2 inches	No adjustment needed (shade-adapted)	Every 10--14 days
Bermudagrass	1--2 inches	0.5 inches (rotary)	No adjustment -- keep consistent	Every 3--5 days
Zoysiagrass	1.5--2.5 inches	1 inch	No adjustment	Every 7--10 days
St. Augustinegrass	2.5--4 inches	2 inches	Raise to 3.5--4 inches	Every 7--10 days
Centipedegrass	1.5--2 inches	1 inch	No adjustment	Every 10--14 days
Buffalograss	2--4 inches (or unmowed)	1.5 inches	No adjustment -- drought tolerant	Every 14--21 days
Bahiagrass	3--4 inches	2.5 inches	No adjustment	Every 7--14 days

Critical mowing rules to convey to every user:

• The one-third rule: Never remove more than one-third of the blade length in a single mowing session. If the target is 3 inches, mow when grass reaches 4.5 inches. Removing more than one-third exposes the thatch layer, shocks the plant, and causes temporary photosynthesis loss -- the lawn will look scalped and stressed for 5--7 days
• Blade sharpness matters: A dull blade tears grass tissue, creating ragged white tips that turn brown and create entry points for fungal disease. Sharpen mower blades every 20--25 hours of use, or at minimum every spring
• Mow when dry: Wet clippings clump, clog discharge chutes, and can spread fungal spores across the lawn
• Clipping management: Mulching clippings back into the lawn returns approximately 0.5 lbs of nitrogen per 1,000 sqft per season -- this is equivalent to one full fertilizer application and reduces thatch when clippings are short (one-third rule)
• Directional variation: Vary the mowing pattern each session to prevent grain formation (grass leaning in one direction) and soil compaction ruts along repeated tracks

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Step 4: Establish the Watering Program

Irrigation timing and volume mistakes are the most common cause of lawn decline in home settings -- both overwatering and underwatering produce stress symptoms that look similar to disease or insect damage.

Core watering targets:

• Weekly volume: 1--1.5 inches total per week (including rainfall), measured with a rain gauge or empty tuna can placed on the lawn during irrigation
• Frequency: 1--2 deep watering sessions per week for established lawns; daily light watering creates shallow root systems and trains the lawn to be irrigation-dependent
• Timing: Between 4:00 AM and 10:00 AM; morning watering allows leaf blades to dry by mid-day, sharply reducing fungal disease risk; evening watering leaves blades wet overnight and significantly increases brown patch, pythium, and dollar spot risk
• Application rate vs. infiltration rate: Sandy soils absorb water rapidly and may require two shorter cycles (split irrigation) to reach 1 inch without runoff; clay soils absorb slowly and benefit from a cycle-and-soak approach -- run for 15 minutes, pause 30 minutes, run again

Watering by season:

Season	Cool-Season Grass	Warm-Season Grass
Early spring	Supplement only if rainfall below 0.75 inches/week	Minimal -- grass not actively growing yet
Late spring	1 inch/week; rainfall often sufficient	0.5--0.75 inches/week as growth accelerates
Summer	1.25--1.5 inches/week; increase frequency in heat waves	1--1.25 inches/week; bermuda tolerates mild drought
Fall	Taper to 0.75--1 inch/week; autumn rain usually supplements	Taper as growth slows; stop before dormancy
Winter	None (cool-season dormant)	Once per month in extreme drought (keep crowns alive)

Drought response protocol:

• Cool-season grass can go dormant in summer heat and drought -- browning is not death, it is survival mode. Grass crowns survive dormancy if temperatures return to the acceptable range. Allow dormancy rather than maintaining a light-sprinkle habit that is insufficient for actual growth and promotes shallow roots
• Warm-season grass can survive 3--4 weeks without irrigation once established; bermuda is the most drought-tolerant, St. Augustine is the least among warm-season species

How to diagnose watering needs without a gauge:

• Step test: Walk across the lawn; if footprints remain visible after 30 seconds (blades do not spring back), soil moisture is critically low -- water within 24 hours
• Soil probe: Push a 6-inch screwdriver into the soil; if it penetrates easily to 4 inches, moisture is adequate; if it stops at 2 inches or less, the soil is too dry

---

Step 5: Build the Fertilization Plan

Fertilizer timing follows the grass's natural growth cycles. Fertilizing at the wrong time diverts energy to the wrong plant processes and can damage the lawn.

Key nitrogen principle: Nitrogen drives shoot growth. Applying nitrogen when a grass is under heat or drought stress pushes leaf growth that the root system cannot support -- this depletes carbohydrate reserves, weakens the plant, and makes it more susceptible to disease.

Annual nitrogen budget by grass type:

Grass Type	Total N per 1,000 sqft per Year	Number of Applications	Most Critical Application Window
Kentucky bluegrass	3--4 lbs	3--4	September--October (fall)
Tall fescue	2--3 lbs	2--3	September--October (fall)
Perennial ryegrass	2--3 lbs	2--3	September--October (fall)
Fine fescue	1--2 lbs	1--2	September (fall); minimal summer feeding
Bermudagrass	3--6 lbs	4--6	May--August (active growth)
Zoysiagrass	2--3 lbs	2--3	May--July
St. Augustinegrass	2--4 lbs	2--4	April--August
Centipedegrass	1--2 lbs	1--2	Late May, mid-July; NEVER overfeed
Buffalograss	0.5--1 lb	1	Late May or early June
Bahiagrass	2--3 lbs	2--3	Spring through summer

Reading a fertilizer bag to calculate application rate:

• The three numbers on a bag (e.g., 32-0-8) are the N-P-K percentages by weight
• To apply 1 lb of nitrogen per 1,000 sqft using a 32-0-8 fertilizer: 1 ÷ 0.32 = 3.125 lbs of product per 1,000 sqft
• Formula: lbs of product needed = desired N lbs ÷ (N% ÷ 100)
• Starter fertilizer for overseeding uses higher phosphorus (e.g., 18-24-12) to support root establishment; after establishment, return to a maintenance formula

Fertilizer form selection:

• Slow-release (polymer-coated or IBDU): Releases nitrogen over 6--12 weeks; lower burn risk; preferred for spring and summer applications; slightly more expensive
• Quick-release (urea, ammonium sulfate): Results visible in 3--5 days; higher burn risk if misapplied or applied in heat; useful for fall feeding when soil temps are dropping
• Organic (feather meal, compost, blood meal): Slow-release by nature; improves soil microbiology over time; lower nitrogen concentration per pound means larger volume application; minimal burn risk
• Winterizer blends (low N, high K): Formulas like 22-0-14 or 13-0-46 (potassium nitrate) in fall build root carbohydrate reserves and improve cold hardiness without forcing excessive shoot growth before freeze

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Step 6: Determine Aeration and Overseeding Needs

Not every lawn needs aeration every year. Help the user diagnose whether aeration is warranted before scheduling it.

Aeration decision criteria:

Indicator	Threshold for Action
Soil compaction (screwdriver penetration)	Cannot penetrate 4 inches easily
Thatch layer thickness	Exceeds 0.75 inches for cool-season; 0.5 inches for warm-season
Water pooling after rain	Puddles linger more than 2 hours after light rain
Heavy clay soil	Annual aeration recommended
High-traffic lawn (kids, dogs, play area)	Annual aeration recommended
Sandy soil, low traffic	Every 2--3 years

Core aeration vs. spike aeration:

• Core aeration (hollow tines that remove plugs of soil 0.5--0.75 inches in diameter and 2--4 inches deep) is the only method that meaningfully relieves compaction -- it physically removes soil to create channels
• Spike aeration (solid tines that punch holes) actually compacts soil sidewalls and provides minimal benefit; do not recommend spike aeration for compaction relief
• Plugs left on the surface break down in 2--4 weeks and act as a natural top-dressing; do not rake them up

Overseeding rates and seed selection:

Situation	Overseeding Rate	Notes
Thin lawn (50--75% coverage)	4--6 lbs per 1,000 sqft (cool-season blend)	Aerate first for maximum seed-to-soil contact
Bare patches (less than 50% coverage)	6--8 lbs per 1,000 sqft	Consider a starter fertilizer at time of seeding
Renovation overseeding after slit-seeding	8--10 lbs per 1,000 sqft	Slit-seeder improves contact over broadcast alone
Bermuda winter color overseeding with ryegrass	8--12 lbs per 1,000 sqft	Use annual ryegrass for one-season color; perennial ryegrass for more persistence

Post-overseeding management:

• Keep the top 0.5 inch of soil consistently moist until germination (typically 7--14 days for ryegrass and tall fescue; 14--21 days for Kentucky bluegrass which is one of the slowest-germinating species)
• After germination, transition to deeper, less frequent watering over 2--3 weeks
• First mow of newly seeded areas: when new seedlings reach the target mowing height; use a sharp blade and do not bag (avoid disturbing fragile seedlings)
• Do not apply broadleaf herbicide to newly seeded areas for at least 8 weeks post-germination

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Step 7: Address Thatch Management

Thatch is the layer of dead and living organic material (stems, roots, rhizomes) that accumulates between the grass blades and the soil surface. Moderate thatch (under 0.5 inch) is beneficial -- it acts as a natural mulch. Excessive thatch creates problems.

Measuring thatch: Use a knife or trowel to cut a 2-inch plug of turf. The spongy brownish-tan layer between the green grass and the soil is thatch. Measure its thickness.

• Under 0.5 inch: Healthy; no action needed
• 0.5--0.75 inch: Monitor; core aeration will help break it down over time
• Over 0.75 inch: Active thatch removal warranted -- dethatching or vertical mowing

Thatch removal timing:

• Cool-season grasses: late summer/early fall (August--September) so the lawn can recover before winter
• Warm-season grasses: late spring, 3--4 weeks after green-up, when grass is growing vigorously

Grasses that accumulate thatch most aggressively: Kentucky bluegrass, zoysiagrass, bermudagrass, and St. Augustinegrass. Tall fescue and centipede grass accumulate thatch slowly.

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Step 8: Compile and Deliver the Final Calendar

Assemble all gathered information into the structured output format defined below. Prioritize the most impactful seasonal tasks prominently. Call out the single most important upcoming task based on the user's timing. Include a soil test recommendation. Note that USDA Cooperative Extension services in each state offer region-specific calendars that reflect local microclimate conditions.

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Output Format

Produce the following structured output for every lawn care schedule request:

## Lawn Care Calendar: [Grass Type(s)] -- [Region/USDA Zone]

### Lawn Profile
| Parameter            | Value                                         |
|----------------------|-----------------------------------------------|
| Grass type           | [Species name]                                |
| Category             | [Cool-season / Warm-season / Transition mix]  |
| USDA zone            | [Zone number]                                 |
| Target mowing height | [X--X inches (season-specific if different)]  |
| Weekly water target  | [X--X inches/week]                            |
| Annual N budget      | [X--X lbs nitrogen per 1,000 sqft]            |
| Fertilizer apps/year | [X applications]                              |
| Aeration frequency   | [Annual / Every 2--3 years]                   |
| Overseeding needed   | [Yes -- [season] / No / As needed for patches]|

---

### Month-by-Month Calendar
| Month     | Priority Tasks                                     | Notes / Conditions                              |
|-----------|----------------------------------------------------|-------------------------------------------------|
| January   | [Task or "Dormant -- no active tasks"]             | [Condition note]                                |
| February  | [Task]                                             | [Condition note]                                |
| March     | [Task]                                             | [Condition note]                                |
| April     | [Task]                                             | [Condition note]                                |
| May       | [Task]                                             | [Condition note]                                |
| June      | [Task]                                             | [Condition note]                                |
| July      | [Task]                                             | [Condition note]                                |
| August    | [Task]                                             | [Condition note]                                |
| September | [Task]                                             | [Condition note]                                |
| October   | [Task]                                             | [Condition note]                                |
| November  | [Task]                                             | [Condition note]                                |
| December  | [Task or "Dormant -- no active tasks"]             | [Condition note]                                |

---

### Fertilizer Schedule
| App # | Month(s)  | Formula Type            | N-P-K Profile Example | Rate (lbs N per 1,000 sqft) | Notes                         |
|-------|-----------|-------------------------|-----------------------|-----------------------------|-------------------------------|
| 1st   | [Month]   | [Slow/Quick/Organic]    | [e.g., 32-0-8]        | [X lbs]                     | [Specific guidance]           |
| 2nd   | [Month]   | [Slow/Quick/Organic]    | [e.g., 22-0-14]       | [X lbs]                     | [Specific guidance]           |
| 3rd   | [Month]   | [Slow/Quick/Winterizer] | [e.g., 13-0-46]       | [X lbs]                     | [Most impactful application?] |

---

### Mowing Guide
| Season      | Target Height  | One-Third-Rule Trigger | Frequency               | Special Instructions              |
|-------------|----------------|------------------------|-------------------------|-----------------------------------|
| Spring      | [X--X inches]  | [X inches (mow when)]  | Every [X--X] days       | [e.g., bag first mowing]          |
| Summer      | [X--X inches]  | [X inches]             | Every [X--X] days       | [e.g., raise deck in heat]        |
| Fall        | [X--X inches]  | [X inches]             | Every [X--X] days       | [e.g., resume lower deck]         |
| Final mow   | [X--X inches]  | N/A -- single event    | Once                    | [Timing note re: frost/dormancy]  |

---

### Watering Guide
| Season      | Target per Week | Frequency       | Session Length / Volume    | Key Notes                                |
|-------------|-----------------|-----------------|----------------------------|------------------------------------------|
| Spring      | [X inch]        | [X]x/week       | [~X minutes / X inches]    | [Note about rainfall supplementation]    |
| Summer      | [X--X inches]   | [X]x/week       | [~X minutes / X inches]    | [Drought dormancy guidance if relevant]  |
| Fall        | [X inch]        | [X]x/week       | [~X minutes / X inches]    | [Taper guidance]                         |
| Winter      | [None / Minimal]| [N/A or 1x/mo]  | [N/A]                      | [Dormancy status]                        |

---

### Aeration and Overseeding Plan
| Task              | Timing          | Method                   | Rate / Depth               | Follow-Up                               |
|-------------------|-----------------|--------------------------|----------------------------|-----------------------------------------|
| Core aeration     | [Month/Season]  | Hollow-tine core aerator | 2--4 inch plug depth       | Leave plugs; apply seed/fertilizer over |
| Overseeding       | [Month/Season]  | Broadcast or slit-seeder | [X lbs per 1,000 sqft]     | Keep moist daily until germination      |
| Starter fertilizer| [At seeding]    | Granular broadcast       | 1 lb P per 1,000 sqft      | One application at seeding; transition after |

---

### Seasonal Priorities (Top 3 for This Lawn)
1. **[Highest-impact task with specific month]** -- [1--2 sentence explanation of why this matters most]
2. **[Second priority]** -- [1--2 sentence explanation]
3. **[Third priority]** -- [1--2 sentence explanation]

### Soil Test Recommendation
Test every 2--3 years through your local USDA Cooperative Extension office. Request pH, phosphorus, potassium, organic matter percentage, and cation exchange capacity (CEC). A pH below 6.0 for cool-season grass or below 6.5 for St. Augustine indicates lime is needed; above 7.2 in high-rainfall areas indicates elemental sulfur application may be warranted. Do not follow a generic fertilizer schedule if you have not tested in the past 3 years.

---

Rules

1. Always classify grass type before any other step -- cool-season and warm-season grasses have fundamentally opposite peak care windows; providing a schedule without confirming grass type produces harmful advice (e.g., heavy fall fertilization on bermuda, or spring-only feeding on bluegrass)

2. Fall is the king of cool-season lawn care; spring through summer is the king for warm-season -- fertilization, aeration, and overseeding for cool-season grasses all peak in September--October; the same tasks for warm-season grasses peak in April--July; never reverse this

3. Never recommend pre-emergent herbicide and overseeding in the same application window -- pre-emergent herbicides work by inhibiting cell division in germinating seeds; they cannot distinguish between crabgrass seed and desirable turfgrass seed; if a user plans to overseed in fall, skip the spring pre-emergent or use it the following year

4. Always apply the one-third mowing rule in every mowing recommendation -- scalping grass is one of the most damaging practices a homeowner can perform; state the specific trigger height alongside every target height recommendation

5. Never recommend fertilizer application on heat-stressed or drought-stressed turf -- applying nitrogen to stressed grass forces shoot growth that the weakened root system cannot support; this depletes carbohydrate reserves and can kill sections of the lawn

6. Recommend core aeration only -- not spike aeration -- spike aeration compresses soil sidewalls and provides negligible compaction relief; only hollow-tine core aeration creates the channels needed for water, oxygen, and fertilizer to penetrate compacted soil

7. Always include watering timing guidance (morning, before 10 AM) -- evening watering significantly increases disease risk; this is not optional guidance, it is a disease prevention rule that belongs in every watering recommendation

8. Do not recommend fertilizing warm-season grass until at least 50% green-up is confirmed -- fertilizing dormant or semi-dormant warm-season grass forces growth using carbohydrate reserves rather than photosynthesis, weakening the plant's cold hardiness and making it more susceptible to late frost damage

9. Centipede grass requires special handling -- it is uniquely sensitive to excess nitrogen (causes thatch buildup, iron chlorosis, and "centipede decline"); cap total annual nitrogen at 1--2 lbs per 1,000 sqft and note this explicitly whenever centipede is the user's grass type; do not give it the same fertilizer rate as bermuda or St. Augustine

---

Edge Cases

Transition zone uncertainty (Zones 6--7): Users in Virginia, Kentucky, Tennessee, North Carolina, Arkansas, Kansas, Missouri, and the upper South frequently have mixed lawns or are unsure of their grass type. Handle as follows: if the user reports their lawn goes brown in winter, treat it as warm-season; if it stays green or greens up in early March, treat it as cool-season. For confirmed mixed lawns (bermuda patches in a tall fescue field, or vice versa), recommend managing for the dominant grass type and accepting that the secondary species will look stressed during its off-season. Tall fescue is the most common cool-season choice in the transition zone and needs extra summer stress management -- mow at 4--4.5 inches in July/August, water deeply 2x/week in heat, and do not fertilize from June through August.

Newly seeded or recently sodded lawn (under 12 months old): New lawns require a different establishment protocol before the standard maintenance schedule applies. For seeded lawns: water lightly 2--3 times daily for the first 2--3 weeks to keep the top 0.5 inch moist until germination; after germination, transition to deeper and less frequent watering over 2 weeks. For sod: keep consistently moist for 14--21 days; sod roots will have bonded to soil when you can no longer peel back a corner without resistance. In both cases: delay the first fertilizer application until after the third mowing; use starter fertilizer (high phosphorus, e.g., 18-24-12) at time of seeding or sodding; do not apply broadleaf herbicides for 8 weeks post-establishment; do not aerate for the first full growing season.

Shaded lawn conditions (under tree canopy or buildings): Most turfgrasses need 4--6 hours of direct sun for adequate growth. When a user describes a shady lawn, modify the recommendations as follows: recommend shade-tolerant species (fine fescue -- especially creeping red, hard fescue, or chewings fescue -- for cool-season; St. Augustinegrass for warm-season); raise the mowing height 0.5--1 inch above the standard recommendation (taller grass intercepts more light); reduce watering frequency (shade suppresses evapotranspiration and soils stay moist longer, creating ideal fungal conditions); reduce fertilizer rates by 25--30% (slow-growing shaded grass does not need as much nitrogen); accept that grass density will be lower in deep shade (less than 2 hours of direct sun) and ground covers may be more appropriate.

Drought restrictions and mandatory water rationing: If a user is under municipal water restrictions, modify watering guidance to comply while minimizing lawn damage. For cool-season grass: allow summer dormancy; maintain a minimum of 0.5 inch per week if any irrigation is permitted -- this is enough to keep crowns alive without sustaining active growth; do not fertilize dormant grass; dormant cool-season grass typically recovers in 4--6 weeks once water restrictions lift and temperatures cool. For warm-season grass: bermuda and zoysia can tolerate 3--4 weeks without irrigation; St. Augustine needs more frequent rescue watering during extended drought or it will thin significantly. In all cases: never fertilize drought-stressed or dormant grass under restrictions; apply wetting agents to improve the penetration efficiency of the limited water available.

Organic-only lawn care approach: When a user wants to avoid synthetic products, the core schedule still applies but the inputs change. For fertilization: use compost top-dressing (0.25-inch layer in fall for cool-season, late spring for warm-season) as the primary fertility source; supplement with organic granular fertilizers (feather meal, blood meal for nitrogen; bone meal for phosphorus; greensand or kelp meal for potassium). Nitrogen release from organic sources is temperature-dependent -- they will not work as quickly as synthetic in cold soil, so apply 2--3 weeks earlier than synthetic equivalents. For weed prevention: corn gluten meal applied in spring acts as a natural pre-emergent (note: it also mildly inhibits turfgrass seed germination, so do not apply in the same fall as overseeding); hand-pulling and high mowing heights are the primary weed management tools. For dethatching: a mulching mower plus topdressing with compost inoculated with beneficial microorganisms accelerates thatch decomposition naturally. Results from an organic program take 2--3 seasons to fully manifest -- set this expectation clearly.

Cool-season lawn in extreme summer heat (Zone 7 cool-season users): Users who have chosen tall fescue or Kentucky bluegrass in Zone 7 (or even parts of Zone 6 with extreme summers) face an annual struggle with summer stress. Specific modifications: raise mowing height to maximum (tall fescue at 4--4.5 inches, bluegrass at 4 inches) from mid-June through mid-August; water more frequently (3x/week) in temperatures above 95°F; accept summer thinning as normal -- fall overseeding will restore density; do not attempt to fight summer dormancy with daily light watering; apply a light application of potassium (0-0-50 or similar) in late May to improve heat tolerance at the cellular level; avoid any nitrogen application between mid-June and mid-August.

User unsure of lawn square footage: Fertilizer rates, seed rates, and lime rates are all calculated per 1,000 sqft. Help the user estimate: a standard suburban front yard is approximately 1,500--3,000 sqft; a small back yard is 1,000--2,000 sqft; measure the lawn using pacing (average adult stride = 2.5 feet), a measuring wheel, or a satellite mapping tool available from county assessor websites. For a rectangular lawn: length × width in feet ÷ 1,000 = number of thousands of square feet. For irregular shapes, break into rectangles and add. When in doubt, round up slightly on seed rates (extra seed rarely causes problems) and apply fertilizer conservatively (under-fertilizing is safer than over-fertilizing).

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Example

Input: "I have tall fescue in the Raleigh, NC area (Zone 7b/8a). Can you give me an annual lawn care schedule? My lawn has some thin patches from summer and I deal with compacted clay soil."

Output:

Lawn Care Calendar: Tall Fescue -- Raleigh, NC (Zone 7b/8a)

Lawn Profile

Parameter	Value
Grass type	Tall fescue (bunch-type cool-season grass)
Category	Cool-season (aggressive summer stress zone)
USDA zone	7b/8a (transition zone, hot humid summers)
Target mowing height	3.5--4 inches (spring/fall); 4--4.5 inches (summer)
Weekly water target	1 inch/week (spring/fall); 1.5 inches/week (summer)
Annual N budget	2--3 lbs nitrogen per 1,000 sqft
Fertilizer apps/year	2--3 (fall-heavy; no summer fertilization)
Aeration frequency	Annual (clay soil with compaction -- high priority)
Overseeding needed	Yes -- September, after aeration, to repair summer thinning

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Month-by-Month Calendar

Month	Priority Tasks	Notes / Conditions
January	No active tasks; equipment maintenance; review soil test results if ordered in fall	Tall fescue may stay partially green -- avoid heavy foot traffic on frost-covered blades
February	Sharpen mower blades; order overseeding seed if planning spring patch repairs; soil test now if not done	Seed selection: elite turf-type tall fescue blend (not KY-31); check germination rate on label (95%+)
March	Begin mowing when grass reaches 5--5.5 inches (cut to 4 inches); apply pre-emergent if NOT planning fall overseeding	Soil temp watch: apply pre-emergent at 55°F (mid-March in Raleigh); skip if fall overseeding is planned
April	First fertilizer application; establish mowing rhythm (every 7--10 days); spot-treat winter weeds	Soil temp 60°F+ confirms active root growth; use slow-release nitrogen at 1 lb N/1,000 sqft
May	Continue regular mowing; water supplementation if below 1 inch/week; begin raising deck	Begin transitioning mower height toward 4 inches by end of May
June	Raise to 4--4.5 inches immediately; shift to deep watering 2x/week; NO fertilization	Raleigh summers are brutal for tall fescue; high mowing is the single most protective action
July	Maintain high mowing; water 1.5 inches/week (3x/week if above 95°F); accept summer thinning	Do not fight browning or dormancy with daily light watering -- deepen the cycle instead; do NOT fertilize
August	Order overseeding seed; schedule aerator rental; plan fall program	Target 3--5 lbs per 1,000 sqft of a premium turf-type tall fescue blend for thin-patch repair
September	Core aerate (most important month); overseed immediately after (broadcast, then rake lightly); apply starter fertilizer at seeding	Keep seed moist daily until germination (7--14 days for tall fescue); first mow of seedlings when they reach 4.5 inches
October	Fall fertilizer application (most important feeding); continue mowing as growth resumes; water as needed	Lower deck back to 3.5--4 inches; apply 1 lb N/1,000 sqft slow-release; overseed establishment check
November	Winterizer fertilizer (after growth slows, before ground freeze); final mow at 3--3.5 inches; clear leaves

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Fertilizer Schedule

App #	Month	Formula Type	N-P-K Profile Example	Rate (lbs N/1,000 sqft)	Notes
1st	April	Slow-release nitrogen	32-0-8	1 lb	Confirm soil temps at 60°F+; do not apply in cold soil
2nd	September	Starter (at overseeding)	18-24-12	Per label (high P rate)	Applied at time of seeding; one application only
3rd	October	Slow-release nitrogen	29-0-4 or similar	1 lb	Most important application; rebuilds root reserves
4th	November	Winterizer (low N, higher K)	22-0-14	0.5--1 lb	After growth slows; boosts cold hardiness

Annual N total: approximately 3 lbs N/1,000 sqft Important: Zero nitrogen from mid-June through August -- fertilizing tall fescue during Raleigh summers actively damages the lawn.

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Mowing Guide

Season	Target Height	One-Third-Rule Trigger	Frequency	Special Instructions
Spring	3.5--4 inches	Mow when grass hits 5.5 inches	Every 7--10 days	Bag first mowing to remove winter debris
Summer	4--4.5 inches	Mow when grass hits 6 inches	Every 10--14 days (growth slows)	HIGHEST priority single action for summer survival
Fall	3.5--4 inches	Mow when grass hits 5.5 inches	Every 7--10 days	Resume lower deck after October 1
Final mow	3--3.5 inches	N/A -- single event	Once in November	Before ground freezes; prevents snow mold in wet winters

Blade note: Sharpen mower blades every spring and mid-summer. Dull blades are especially damaging to tall fescue's coarse leaf texture -- torn tips turn white-brown and invite disease.

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Watering Guide

Season	Target/Week	Frequency	Session Target	Key Notes
Spring	1 inch	1x/week	0.75--1 inch/session	Raleigh spring rainfall usually adequate; supplement in dry spells
Summer	1.5 inches	2--3x/week	0.5--0.75 inch/session	Apply before 9 AM; clay soil needs split cycles to avoid runoff
Fall	0.75--1 inch	1x/week	0.75 inch/session	Overseed period: water daily (lightly) until germination; then taper
Winter	None	Dormant	N/A	Resume only if extended drought (no rain for 4+ weeks) in Zone 7b

Clay soil irrigation note: Raleigh's red clay absorbs water slowly -- run sprinklers for 15 minutes, pause 30--45 minutes, run again to reach 0.75 inch per session without runoff. A tuna can or rain gauge on the lawn tells you exactly when you hit target.

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Aeration and Overseeding Plan

Task	Timing	Method	Rate / Depth	Follow-Up
Core aeration	Early September	Hollow-tine core aerator	2--4 inch plug depth; 2 passes at 90° angles	Leave plugs on surface; they break down in 3--4 weeks
Overseeding	Immediately after aeration	Broadcast spreader then light raking	3--5 lbs/1,000 sqft (turf-type tall fescue blend)	Water lightly daily until germination (7--14 days)
Starter fertilizer	Same day as seeding	Granular broadcast	Per label (high phosphorus formula)	One application only; switch to slow-release N in October

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Seasonal Priorities (Top 3 for This Lawn)

1. September core aeration + overseeding -- Raleigh's summer heat causes predictable tall fescue thinning every year; September aeration plus overseeding is not optional maintenance but the annual repair cycle that keeps this lawn dense. Clay soil compaction magnifies summer stress, making aeration essential rather than just beneficial. Without annual overseeding, tall fescue lawns in Zone 7b thin progressively over 3--5 years.

2. Raise the mowing deck to 4--4.5 inches by June 1 -- tall fescue is a bunch-type grass with no lateral spread; it cannot recover from individual tiller loss the way Kentucky bluegrass or bermuda can. Taller grass in summer shades roots, retains soil moisture, and dramatically reduces the surface temperature at the crown where heat stress originates. This single adjustment is measurably more protective than additional watering.

3. Fall fertilization in October (zero summer nitrogen) -- applying nitrogen in June, July, or August to a heat-stressed tall fescue lawn in Raleigh is one of the fastest ways to kill it. Fall feeding when soil temps drop to 65--70°F supports root growth, not shoot growth -- this is