Weed Killer for St. Augustine Lawns

Selective weed killers designed for St. Augustine lawns. Control broadleaf weeds, sedges, and grassy weeds with products safe for St. Augustine and expert Lawn Synergy support.

Weed Killer for St. Augustine Lawns — St. Augustine grass is a popular warm-season turf, but it is also more sensitive to herbicides than many other grass types. Using the wrong weed killer can cause serious damage. This collection features selective herbicides that work safely on St. Augustine lawns, helping you control weeds without harming your turf when applied as directed.

From common broadleaf weeds like clover and spurge to nutsedge and certain grassy weeds, these professional-grade products are widely used on St. Augustine lawns. This collection is designed to help you choose products that balance strong weed control with turf safety.

When you purchase from Lawn Synergy, you’re backed by expert support. If you’re unsure which product is right for your lawn—or need help with mixing rates, timing, or application techniques—our team is here to help you get professional results with confidence.

Weeds This Collection Helps Control in St. Augustine

  • Broadleaf weeds: clover, spurge, chickweed, plantain, dandelion
  • Sedges: yellow nutsedge and other sedge species
  • Grassy weeds: crabgrass and certain annual grassy weeds
  • Tough weeds: deep-rooted and difficult-to-control warm-season weeds

Quick Guide: Pick the Right Weed Killer

Weed Problem Great Product Options Why It Works
General Broadleaf Weed Control Celsius WG, Celsius Xtra, Atrazine Excellent broadleaf control with strong St. Augustine turf safety
Tough or Mixed Weed Pressure Celsius Xtra, Negate, Atrazine Broader-spectrum control while remaining safe on St. Augustine when applied correctly
Nutsedge SedgeHammer, Certainty, Vexis(granular) Targets sedges specifically without damaging St. Augustine turf
Crabgrass & Grassy Weeds Quintessential Controls certain grassy weeds with careful timing and proper application
Specialty Weed Situations Celsius Xtra, Vexis, Quintessential Used in specific situations—expert guidance strongly recommended

Frequently Asked Questions

Are these weed killers safe for St. Augustine grass?

Yes, when applied according to label directions. St. Augustine is more sensitive than other turf types, so product choice, rate, and timing are critical.

What is the best weed killer for St. Augustine lawns?

Celsius WG is widely considered one of the safest and most effective options for St. Augustine lawns.

What kills nutsedge in St. Augustine grass?

SedgeHammer, Celsius Xtra, and Certainty are commonly used for nutsedge control in St. Augustine lawns.

Can I control crabgrass in St. Augustine?

Yes, but timing matters. Products like Quintessential can help when applied correctly and under the right conditions.

When should I spray weed killer on St. Augustine lawns?

Spray when weeds are actively growing and St. Augustine is healthy and not under heat or drought stress.

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