Weeds in Zoysia: A Month-by-Month Control Guide for Georgia

Weed control in Zoysia isn't reactive — it's a calendar. Know what's coming, block it before it germinates, and you'll spend almost zero time pulling weeds mid-summer. Here's the playbook.

The Reality

Healthy, dense Zoysia naturally resists weeds. If you have a chronic weed problem, it's almost always a symptom of something else — thin turf from shade, disease, or poor soil prep. Treat weeds, yes, but also build the lawn density that makes weeds unwelcome in the first place.

Month-by-Month Weed Calendar

January – February: Henbit and Chickweed

• These winter annuals germinated in fall and are actively growing now in your dormant Zoysia.
• Spot treat with a broadleaf herbicide (atrazine or 2,4-D based) on a mild day (above 45°F).
• They'll die back naturally in spring, so treatment is optional — but getting ahead of them prevents seed set.

March: Pre-Emergent Window — Your Most Important Month

• Apply pre-emergent when soil temps hit 50–55°F. This blocks crabgrass, goosegrass, and other summer annuals.
• Prodiamine or pendimethalin are the standard choices.
• This single application prevents 90%+ of summer weed headaches.

April – May: Broadleaf Weeds (Dandelion, Clover, Spurge)

• Now that Zoysia is greening up, broadleaf weeds become visible.
• Spot treat with a three-way broadleaf herbicide (2,4-D + MCPP + dicamba). Atrazine also works on Zoysia and handles a broader spectrum.
• Apply on a calm, warm day (65–85°F). Avoid windy days near ornamentals.

June – July: Crabgrass and Goosegrass

• If pre-emergent was applied on time, you should have minimal pressure.
• If you missed the window, use a post-emergent: fenoxaprop (Acclaim Extra) or quinclorac (Drive XLR8) for crabgrass on Zoysia.
• Do not use MSMA on most Zoysia varieties — it can cause damage.
• Multiple applications needed for large infestations. Adjust your timing expectations.

August: Nutsedge

• Nutsedge looks like a grass blade but grows faster and lighter green. It's a sedge, not a true grass, and requires a different chemistry.
• Halosulfuron (SedgeHammer) or sulfentrazone (Dismiss) are effective on Zoysia.
• Expect 2–3 weeks to see full response. Re-apply if needed after 6–8 weeks.
• Nutsedge reappears from underground tubers — control requires persistent treatment over 1–2 seasons.

September: Fall Pre-Emergent + Late Broadleaf

• Apply fall pre-emergent when soil temps drop to 70°F (usually mid-September). This stops poa annua and henbit.
• Spot treat any remaining broadleaf weeds before Zoysia goes dormant.

October – December: Poa Annua Watch

• Poa annua germinates in cool temps and is common in Georgia Zoysia lawns over winter.
• If fall pre-emergent was applied, this should be minimal.
• Spot treat with atrazine if needed. Poa dies out naturally in summer heat.

Pro Tips

• Atrazine is Zoysia's friend. Few herbicides are as well-tolerated by Zoysia and as broad-spectrum effective. Learn to use it correctly.
• Don't spray herbicide on stressed turf. Heat-stressed, drought-stressed, or dormant Zoysia is more susceptible to herbicide injury. Treat when the turf is healthy and actively growing.
• Read the label for temperature restrictions. Many broadleaf herbicides should not be applied above 85°F or in direct midday summer sun.
• Dense grass beats chemical dependence. A thick, healthy Zoysia turf is your best long-term weed suppressor. Invest in soil health, proper fertilization, and correct mowing height — weeds can't compete with a well-managed lawn.