Seasonal guidance on mowing height, watering, aeration, and recovery.
January
Mowing: No mowing.
Watering: Only during warm spells if the ground is not frozen.
Aeration: No.
Dethatch: No.
Seeding: No.
Notes: Avoid heavy foot traffic on dormant turf.
February
Mowing: No mowing.
Watering: Minimal.
Aeration: No.
Dethatch: No.
Seeding: No.
Notes: Plan spring aeration and soil testing.
March
Mowing: Begin once growth starts; keep higher height.
Watering: Light if dry.
Aeration: Possible if soil is not saturated.
Dethatch: Light dethatch if needed.
Seeding: Early overseed for thin areas.
Notes: Apply pre-emergent when soil temps reach about 55F.
April
Mowing: Regular weekly cuts; keep 3-3.5 inches.
Watering: 1 inch per week total.
Aeration: Best window if compacted.
Dethatch: Only if thatch exceeds 0.5 inch.
Seeding: Overseed after aeration.
Notes: Avoid heavy herbicides near fresh seed.
May
Mowing: Weekly; keep height high.
Watering: Deep watering 1-2x per week.
Aeration: Optional if needed.
Dethatch: Avoid heavy dethatching in heat.
Seeding: Spot seed only.
Notes: Watch for fungus as humidity rises.
June
Mowing: Weekly; keep height high.
Watering: Deep watering; avoid shallow daily watering.
Aeration: No.
Dethatch: No.
Seeding: No (heat stress).
Notes: Monitor irrigation coverage.
July
Mowing: Weekly; keep height high.
Watering: Deep 1-2x per week; early morning.
Aeration: No.
Dethatch: No.
Seeding: No.
Notes: Heat stress management; reduce traffic.
August
Mowing: Weekly; keep height high.
Watering: Deep; adjust for drought.
Aeration: Plan for fall.
Dethatch: No.
Seeding: No.
Notes: Prepare for fall renovation.
September
Mowing: Weekly; gradually reduce height.
Watering: Deep watering; reduce as temps drop.
Aeration: Prime window.
Dethatch: Best window if needed.
Seeding: Primary overseeding window.
Notes: Apply fall fertilizer and seed after aeration.
October
Mowing: Weekly or bi-weekly.
Watering: Light as temps cool.
Aeration: Still possible early month.
Dethatch: Light if needed.
Seeding: Last chance for overseeding.
Notes: Leaf cleanup prevents snow mold.
November
Mowing: Final mow once growth slows.
Watering: Minimal.
Aeration: No.
Dethatch: No.
Seeding: Dormant seeding possible late month.
Notes: Apply winterizer fertilizer.
December
Mowing: No mowing.
Watering: Minimal.
Aeration: No.
Dethatch: No.
Seeding: Dormant seeding optional.
Notes: Protect turf from traffic and salt.
Plant Health Highlights
Bigleaf Hydrangea (Hydrangea macrophylla)
Classic Long Island mophead/lacecap hydrangea. Blooms on old wood unless reblooming cultivar.
Blue Summer Hydrangea (Endless Summer line)
Popular reblooming hydrangea often stocked on Long Island. Flower color skews bluer in acidic soil.
Bloomstruck Hydrangea
Reblooming bigleaf type with stronger stems and improved cold resilience for Northeast gardens.
Summer Crush Hydrangea
Compact Endless Summer cultivar, widely used for front foundations and smaller estate beds.
Long Island Sod Options
Kentucky Bluegrass
Best for: Classic lawn look, high wear areas
Sun: Full sun
Water: Moderate to high
Excellent recovery but needs more water and maintenance.
Tall Fescue (Turf Type)
Best for: Drought tolerance and deep roots
Sun: Full sun to part shade
Water: Moderate
Great for Long Island summers; less irrigation needed.
Fine Fescue Blend
Best for: Shadier lawns and low maintenance
Sun: Part shade
Water: Low to moderate
Softer texture, slower recovery in heavy traffic areas.
Perennial Ryegrass Blend
Best for: Quick establishment and wear
Sun: Full sun to part shade
Water: Moderate
Fast germination, often mixed with fescues for durability.
Turf Renovation: Sod, Seed, Topdressing, Aeration
Sod Installation
Best window: April - June and September - October
Technical standard: Strip old turf, grade for drainage, install 2-4 inches of quality topsoil blend, roll and seam tightly, then irrigate deeply after install.
Most failures come from poor base prep and shallow watering. Keep new sod consistently moist for 2-3 weeks, then transition to deep/infrequent watering.
Overseeding / Lawn Seeding
Best window: Primary: September; Secondary: April (lighter success rate)
Technical standard: Core aerate first, seed at label rate with turf-type tall fescue or blended cool-season mix, then topdress lightly for seed-to-soil contact.
Do not apply crabgrass pre-emergent where you intend to seed. September gives the highest germination and strongest root establishment on Long Island.
Topsoil Dressing (Topdressing)
Best window: April - May or September after aeration
Technical standard: Apply 0.25-0.5 inch screened compost/topsoil blend and brush into aeration holes without smothering turf crowns.
Improves organic matter, smooths grade, and boosts microbial activity. Avoid heavy layers that block light and air.
Core Aeration
Best window: September (best), April (secondary)
Technical standard: Pull 2-3 inch cores at high pass density on compacted soil; leave plugs to break down naturally and irrigate after operation.
Essential for compaction relief and oxygen exchange. Pair with overseeding and topdressing for full turf renovation results.
Dethatching / Vertical Mowing
Best window: Early spring or early fall
Technical standard: Perform only when thatch exceeds ~0.5 inch and turf is actively growing so recovery can occur quickly.
Aggressive dethatching in summer heat can thin turf severely. Follow with seed and light fertility if thatch removal is heavy.
