Coastal South Carolina lawns live in a different environment than inland turf. Salt air from the Atlantic, sandier soil, extreme summer heat, and a longer growing season all shape what your lawn needs — and when.
Most lawns in Myrtle Beach and Charleston are warm-season grasses: Bermuda, Zoysia, St. Augustine, or Centipede. This guide covers what to do month by month for these grass types in coastal SC.
January – February: Dormancy Period
Warm-season grasses are dormant and brown. This is the low-maintenance window.
- Mowing: Stop mowing. If you have a cool-season overseeded lawn (ryegrass), mow at 1.5–2 inches as needed.
- Watering: Minimal. Natural rainfall is usually sufficient. Only water if you've had 2+ weeks with no rain and the ground is bone dry.
- Fertilizing: Do not fertilize dormant warm-season grass. You'll feed weeds and stimulate vulnerable new growth before the last frost risk.
- Weed control: Good time for pre-emergent herbicide (late February) to prevent crabgrass before it germinates.
March: Wake-Up Month
Soil temperatures start climbing toward 55–60°F — the threshold when warm-season grass begins to green up along the coast.
- Scalp the lawn (Bermuda/Zoysia): Mow at the lowest setting once to remove dead thatch and let sunlight reach the soil. Only do this once; this encourages faster green-up.
- Pre-emergent herbicide: Apply if you didn't in February. Target crabgrass, goosegrass, and spurge before soil temps hit 65°F.
- Light fertilization: Wait until you see active green growth (typically late March in Myrtle Beach, slightly earlier in Charleston's milder microclimate) before applying any starter fertilizer.
- Irrigation check: Test your sprinkler system before you need it. Fix heads, check coverage, replace worn seals.
April – May: Active Growth Begins
This is when things pick up. Coastal SC springs are mild and perfect for establishing turf health before the heat stress of summer.
- Mowing: Begin regular mowing. Bermuda: 1–1.5 inches. Zoysia: 1–2 inches. St. Augustine: 3–4 inches. Centipede: 1.5–2 inches. Never cut more than one-third of the blade in a single mowing.
- Fertilize: Apply a balanced slow-release fertilizer (e.g., 16-4-8 or similar). St. Augustine and Centipede are sensitive to excess nitrogen — lighter applications are better than heavy ones.
- Aeration: Core aerate in May if your lawn is compacted or has heavy thatch. Sandy coastal soils compact less than clay soils, but high-traffic areas still benefit.
- Weed watch: Spot-treat broadleaf weeds (clover, dollarweed, oxalis) as they appear. Avoid blanket herbicide applications when temps exceed 90°F.
June – August: Summer Stress Period
This is the hardest time to maintain a coastal SC lawn. Heat, humidity, and frequent rain followed by drought cycles create ideal conditions for fungal disease and pest damage.
- Mowing: Raise the mowing height slightly. Taller grass shades roots, retains moisture, and is more heat-tolerant. Mow frequently enough that you're never removing more than one-third of the blade.
- Watering: 1 inch per week (rain + irrigation combined). Water deeply 2–3x per week rather than daily shallow watering. Water in the early morning — never at night, which promotes fungal disease.
- Fertilizing: Skip or go very light in July–August. Heavy nitrogen during heat stress increases disease susceptibility and burns grass.
- Watch for chinch bugs (St. Augustine): These appear as yellow-brown patches that spread outward. Part the grass where it meets healthy turf — if you see small black insects with white wings, treat immediately.
- Watch for armyworms: Late summer armyworm invasions are common on the Grand Strand. Patches of lawn that look like they've been mowed overnight are a telltale sign. Treat with bifenthrin or permethrin-based insecticide within 48 hours.
- Brown patch fungus: High humidity + warm nights = brown patch conditions. Large irregular brown circles indicate fungal disease, not drought. Treat with propiconazole or azoxystrobin fungicide.
September – October: Recovery Season
Temperatures moderate and grass enters its second active growth phase. This is the window to repair summer damage.
- Fertilize: Apply a potassium-rich fertilizer (0-0-50 or similar) to harden grass for winter dormancy. Avoid high nitrogen in October, which promotes soft growth that won't survive the first frost.
- Overseed (optional): If you want a green lawn through winter, overseed with annual ryegrass in late October when soil temps drop below 65°F.
- Aeration and dethatching: If you didn't aerate in spring, do it now before the growing season ends.
- Weed control: Post-emergent herbicide for broadleaf weeds while they're still actively growing.
November – December: Wind-Down
- Final mow: Mow at normal height (avoid scalping going into winter). Remove leaf debris promptly — matted leaves over dormant grass invite disease.
- Irrigation: Turn off automatic irrigation or switch to manual. Coastal SC winters rarely require irrigation, and overwatering dormant grass promotes root rot.
- Pre-emergent (late November): Apply pre-emergent herbicide for cool-season weed prevention (annual bluegrass, henbit, chickweed).
Salt Tolerance Notes for Coastal Properties
Properties within a mile of the coast in Myrtle Beach, Isle of Palms, Folly Beach, or Pawleys Island deal with salt spray and occasional storm surge. Bermuda grass and Zoysia are the most salt-tolerant warm-season grasses; St. Augustine is moderately tolerant; Centipede is the most salt-sensitive.
After a storm event that covers the lawn in saltwater, rinse the turf with fresh water as soon as possible and avoid fertilizing until the grass shows signs of recovery.
When to Hire a Lawn Care Pro
Some homeowners prefer to manage their own lawns — this guide gives you the framework to do that. But for pest identification, disease treatment, irrigation system setup, and renovation work (sodding, seeding, grading), hiring a local professional who knows coastal SC turf conditions is worth it.
ProPulse lists lawn care companies in Myrtle Beach and Charleston who specialize in warm-season coastal turf. Local knowledge matters — a company that cuts lawns in Charlotte is operating in a different climate than one that works the Grand Strand year-round.