Weed Control Guide for Myrtle Beach Homeowners

Myrtle Beach's warm, humid climate that makes coastal South Carolina so appealing to residents is equally appealing to weeds. Crabgrass, goosegrass, dollarweed, and nutsedge thrive in the same conditions as your lawn — and they grow aggressively. A proactive weed control program is far more effective than reactive pulling and treating, and it starts with understanding what you're dealing with.

The Most Common Lawn Weeds in Myrtle Beach

Crabgrass

The most notorious annual weed in Horry County. Crabgrass germinates in late spring, grows aggressively through summer heat, then dies with the first frost — leaving bare patches. It takes over thin or stressed areas of lawn and produces thousands of seeds before dying, ensuring it returns next year. Preventing germination with a pre-emergent is far more effective than killing established crabgrass.

Goosegrass

Similar to crabgrass but more heat and drought tolerant — meaning it often survives when crabgrass struggles. Common in compacted soil areas and along edges. Pre-emergent timing is the same as crabgrass.

Dollarweed (Pennywort)

Common in Myrtle Beach's poorly drained and over-irrigated lawns. Round, shiny leaves about the size of a silver dollar. Thrives in wet conditions. Prevention: reduce overwatering and improve drainage. Control: specific post-emergent products or hand removal.

Nutsedge (Yellow/Purple)

Grows faster than grass in summer heat and stands out as bright yellow-green blades above the turf. Extremely difficult to control once established due to underground nutlets. Requires specific nutsedge-targeted products — standard broadleaf herbicides don't work on sedge.

Broadleaf Weeds (Clover, Chickweed, Henbit)

Spring and fall broadleaf weeds that appear in thin turf areas. Generally easier to control than grassy weeds with standard broadleaf post-emergents.

Pre-Emergent Weed Control: Your Most Powerful Tool

Pre-emergent herbicides prevent weed seeds from germinating. Applied before weeds sprout, they're dramatically more effective than trying to kill established weeds. They do NOT kill existing weeds — they only prevent new ones from emerging.

Myrtle Beach Pre-Emergent Timing

• Spring application (crabgrass, goosegrass): Late February – mid-March. Target soil temperature: 55°F for 3+ consecutive days
• Fall application (winter annuals: chickweed, henbit, annual bluegrass): Late September – October. Target soil temperature: below 70°F

Common Pre-Emergent Products

• Pendimethalin — widely available, effective on most annual grasses and some broadleafs
• Prodiamine — longer residual than pendimethalin, good for extended season protection
• Dithiopyr — unique in that it provides some post-emergent control on young crabgrass as well

Note: Pre-emergents prevent ALL seed germination — don't apply to areas you plan to overseed within 8–12 weeks.

Post-Emergent Control: When Weeds Are Already Up

Grassy Weeds (Crabgrass, Goosegrass)

Products like quinclorac (Drive XLR8) are effective on young crabgrass in most Myrtle Beach warm-season turf. Treat when plants are young — 2–4 tillers. Established mature crabgrass is much harder to kill. Nutsedge requires halosulfuron (Sedgehammer) or sulfentrazone products.

Broadleaf Weeds

Standard three-way broadleaf herbicides (2,4-D, MCPP, dicamba combinations) handle most broadleaf weeds. Follow label instructions for your specific grass type — some formulations can harm St. Augustine and Centipede at certain rates.

Lawn Health is Weed Prevention

A thick, healthy, properly fertilized lawn is your best long-term weed defense. Weeds exploit bare soil, thin turf, and stressed grass. The better your lawn's overall health, the less opportunity weeds have to establish. This means: proper mowing height, appropriate fertilization timing, adequate irrigation, and addressing any pest or disease issues promptly.