The Horry County Lawn Calendar
What to do each month on coastal South Carolina turf — and what to skip.
Almost every lawn in Horry County is warm-season grass, and warm-season grass runs on a completely different schedule than the fescue lawns most online advice is written for.
Centipede, St. Augustine, Bermuda, and zoysia all go dormant in winter, wake up in spring, and do their real growing in summer heat. Feed them at the wrong time and you either waste the product or actively damage the lawn. Here's the timing that works on this coast.
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December – February — Dormancy March – May — Green-up June – August — Peak growth September – November — Wind-downDecember – February: Dormancy
December
Lawn is dormant or nearly so. Brown is normal and does not mean dead.
Do: Keep leaves cleared — a wet leaf mat smothers dormant turf and invites disease. Service your mower.
Don't: Fertilize. Nitrogen on dormant warm-season grass feeds winter weeds, not your lawn.
January
The quietest month. Winter weeds are the only thing actively growing.
Do: Post-emergent treatment for winter weeds like chickweed, henbit, and annual bluegrass while they're small.
Don't: Aerate or dethatch. Dormant turf can't recover from the injury.
February
The most important timing decision of the year, and on this coast it comes earlier than most guides say.
Do: Get pre-emergent down before soil temperatures reach 55°F. Our own program runs the first pre-emergent application in January and a second in February — because waiting for the calendar to say "spring" is how crabgrass wins here.
Don't: Wait until you see crabgrass. Pre-emergent does nothing to a weed that has already germinated.
Miss the pre-emergent window and you fight weeds all year
This is the most common expensive mistake we see. Crabgrass germinates as soil warms in late winter, and once it's up, your only options are post-emergent treatments that are harder on the lawn and less effective. Timing beats product here.
March – May: Green-Up
March
Green-up begins. Growth is uneven — sunny areas wake first.
Do: Begin mowing as growth starts. Spot-treat winter weeds.
Don't: Fertilize yet. This is the second most common mistake. Feeding before the lawn has fully greened up pushes weak top growth and, on centipede especially, invites disease.
April
The lawn should be mostly green now.
Do: First fertilizer application once the lawn is fully green and actively growing — generally mid to late April here. Begin regular mowing.
Don't: Scalp the lawn trying to remove dormant material. Lower the deck gradually if at all.
May
Growth accelerates. Fire ant mounds become obvious.
Do: Fire ant treatment. Second pre-emergent application to cover summer weeds. Set the mowing height for summer — higher is better.
Don't: Let clippings mat up. Mow often enough to remove no more than a third of the blade.
June – August: Peak Growth
June
Heat arrives and warm-season grass loves it.
Do: Water deeply and infrequently — roughly an inch per week including rain, in one or two soakings. Raise mowing height for heat.
Don't: Water lightly every day. Shallow watering builds shallow roots that fail in August.
July
Peak heat and peak growth. Also peak disease pressure with our humidity.
Do: Water early morning so blades dry during the day. Watch for brown patch and dollar spot in humid stretches.
Don't: Water in the evening. Wet grass overnight is how fungal disease establishes.
August
The hardest month on a lawn here. Heat, humidity, and often drought stress at once.
Do: Keep mowing height high. Monitor for armyworms — they can strip a lawn in days.
Don't: Apply heavy nitrogen in extreme heat. It stresses turf that's already working hard.
Armyworms are worth knowing about
Late summer, they can move across a lawn fast enough that it looks like drought damage overnight. If a green lawn browns rapidly in patches in August or September, look closely for caterpillars at the soil line before assuming it's water.
September – November: Wind-Down
September
Heat eases. This is a good recovery window.
Do: Fall pre-emergent for winter weeds when soil temperatures drop toward 70°F. Continue mowing.
Don't: Skip the fall pre-emergent. It's what prevents the winter weeds you'd otherwise be spraying in January.
October
Growth slows noticeably as nights cool.
Do: Final fertilizer application — low nitrogen, with potassium to support winter hardiness. Keep leaves off the lawn.
Don't: Apply high nitrogen now. Late nitrogen pushes tender growth right before dormancy and increases winter damage.
November
Dormancy begins. Color fades — expected, not a problem.
Do: Final mow. Clear leaves. Note bare or problem areas to address next spring.
Don't: Panic about brown grass. Warm-season turf browning in late fall is doing exactly what it should.
The Three Timing Rules That Matter Most
- Pre-emergent in late February, before crabgrass germinates. Then again in fall for winter weeds.
- Don't fertilize until the lawn is fully green — usually mid-April, not March.
- Stop nitrogen by October. Late feeding causes winter injury.
Everything else is adjustment. Get these three right and you're ahead of most lawns on your street.
We'll identify your turf type and tell you exactly where you are in this calendar.