What to do each month, from the first mow window in March through the
final blow-off in November and the dormant-prune work that carries you
into the next spring.
Cool nights, soggy soil, and the first crocuses. The lawn isn't ready for a heavy mow yet, but the prep work that decides the rest of the year happens this month.
Pre-emergent crabgrass control goes down in the late-March window — soil temps at 50-55°F at 2-inch depth are the trigger.
Sharpen mower blades and service the equipment before the first cut.
Dormant prune shrubs (boxwood shaping, deadwood removal on summer-bloomers).
Cut back ornamental grasses to 4-6 inches before new growth pushes.
Walk the property for winter damage — sunken sod, salt burn at curb strips, sticks and storm debris.
Peak growth month. Weekly mowing is non-negotiable and the spring fertilizer goes down to feed the green-up without pushing flush growth that fungus loves.
Spring fertilizer application (light nitrogen — heavy spring N causes summer disease).
Weekly mowing at 3.5-4 inches with sharp blades.
Mulch install peak season — landscape beds get the big spring refresh.
First hedge trim window opens early-to-mid May while new growth is still soft.
Spot-treat broadleaf weeds (dandelions, clover) on calm mornings.
The hottest, driest stretch of the year. Cool-season grass would rather rest than grow, and pushing it with fertilizer or short mowing now will burn the lawn.
Raise mowing height to 4 inches — taller turf shades the soil and holds moisture.
Spot-treat weeds rather than blanket-spraying in heat.
Monitor for brown patch fungus on tall fescue, especially in shaded humid areas.
Do not fertilize cool-season lawns in July — wait for fall.
Keep mower blades sharp; dull blades shred the heat-stressed leaf and brown the tips.
The single most important month for cool-season lawn health in Central Ohio. Soil temperatures drop into the upper 60s and seed germinates without baking.
Core aeration with pulled plugs (not spike rolling).
Overseed with a turf-type tall fescue or KBG blend immediately after aerating.
Fall fertilizer round 1 — starter or balanced NPK over the new seed.
Leaf cleanup begins on properties under heavy canopy late in the month.
Drop mowing height back to 3.5 inches as growth resumes.
The other peak lawn month. Overseeding can still go through mid-October on a tight watering schedule, and the leaf-cleanup work shifts from weekly to a real focus.
Continue overseeding through mid-October (cooler nights still germinate).
Fall pre-emergent application for winter annual weeds (henbit, chickweed, poa annua).
Gutter cleanup once the canopy drops the bulk of its leaves.
Full leaf cleanup passes — every 7-10 days under heavy canopy.
Last mulch refresh window for beds going into winter.
Growth slows, leaves finish dropping, and the lawn gets one last short cut to head into dormancy clean. The fall fertilizer round that matters most is the winterizer.
Final mow of the season at 2.5-3 inches — shorter than summer but not scalped.
Winterizer fertilizer (high potassium) goes down to harden the turf for cold.
Drain and blow out irrigation systems before the first hard freeze.
Final hedge trim on summer-bloomers and shape reset on evergreens.
Bag the final leaf pass — mulching too many late leaves smothers the crown.
Coldest month of the year, but the best month for dormant pruning on fruit trees and ornamentals. Equipment shop work happens now so April doesn't catch you flat.
Dormant prune fruit trees and large ornamentals (apples, pears, crabapples).
Late winter is the final stretch before the pre-emergent window opens. Last chance for dormant prune work and the right month to lock in spring mulch deliveries.
Order grass seed and finalize the spring blend before April rates jump.
Last dormant pruning window on summer-bloomers and overgrown shrubs.
Schedule spring mulch deliveries with the supplier.
Inspect lawn for snow mold patches as snow melts.
Test soil pH if you didn't in fall — results come back in time for an April lime pass.
If you're on a maintenance contract with Lawn Harmony Landscaping, the mowing,
edging, blow-off, hedge windows, mulch refresh, aeration, leaf cleanup,
and winterizer fertilizer are all handled on schedule by the owner.
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