The Floratam variety of St. Augustine grass often requires targeted weed control that protects the lawn while eliminating common intruders like dandelions, clover, and crabgrass. Below is a curated list of five reliable weed killers and weed-and-feed products designed for Southern lawns, including Floratam. Each option is evaluated for effectiveness, coverage, and suitability for Floratam and similar warm-season grasses. Use as directed on the label to avoid lawn stress or damage.
| Product | Brand | Typical Coverage | Notes |
|---|---|---|---|
| Season Long Lawn Weed Killer + Preventer | BioAdvanced | 4,000 sq ft | Kills and prevents weeds for up to 6 months on southern lawns, including Floratam varieties |
| 3-in-1 Weed and Feed | BioAdvanced | 20 lb bag (coverage varies by area) | Weed killer plus fertilizer tailored for Southern lawns, including Floratam |
| Turf Builder Weed & Feed3 | Scotts | Up to 5,000 sq ft | Combines weed control with lawn fertilizer to thicken turf |
| Weed Killer for Lawns | Ortho | 1 gal bottle formats for spot use | Effective on listed weeds; not recommended for Floratam on some applications |
| Weed & Grass Killer₄ | Roundup | 1.33 gal / 64 oz variants available | Kills weeds and grasses to the root; suitable for diverse lawn setups |
Ortho WeedClear Weed Killer for Lawns with Comfort Wand
Brand: Ortho
Overview: Ortho WeedClear is a fast-acting option designed to target a wide list of weeds, including dandelion and clover, down to the root. This product is intended for lawn use and is suitable for several grass types, but it should be applied with care on Floratam lawn varieties due to certain spot-treatment limitations noted on the label. The Comfort Wand applicator enables precise spot treatments, reducing risk to the surrounding turf.
Key Features: Kills over 250 listed weeds; fast results; root-kill action; directs applications to weeds while sparing the lawn when used as directed. Note that Floratam-specific restrictions may apply for some grass types.
BioAdvanced Season Long Lawn Weed Killer + Preventer
Brand: BioAdvanced
Overview: This 10-lb granular formula is designed for southern lawns, providing both immediate weed control and preventive action for up to six months. It targets a broad spectrum of common broadleaf weeds such as dandelion and clover, and includes a residual component to curb re-emergence. It is suitable for Floratam and other Floridian warm-season grasses when used as directed.
Key Features: Kills and prevents weeds up to 6 months; suitable for St. Augustinegrass and Floratam; treats up to 4,000 sq ft; residual herbicide helps reduce regrowth.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns
Brand: BioAdvanced
Overview: This granular formula blends weed control with lawn feeding, targeting Floratam and other southern grasses. It emphasizes weed killer action for common broadleaf weeds like dandelion and dollarweed, while supplying nutrients to strengthen the lawn. The product is positioned as a long-term maintenance solution with up to six months of protection against listed weeds.
Key Features: Southern lawn focus; includes fertilizer; kills list of broadleaf weeds; up to six months of protection; supports Floratam health when used as directed.
Roundup Weed & Grass Killer₄
Brand: Roundup
Overview: Roundup Weed & Grass Killer₄ is a broad-spectrum product designed for lawns, landscapes, and other outdoor areas. It kills tough weeds and grasses to the root, with rapid visible results. It’s rainproof in 30 minutes and allows for planting after a short waiting period. The product is suitable for Kentucky bluegrass and fescue varieties; Floratam compatibility should be verified on the label for specific lawn types.
Key Features: Kills to the root; fast action; rainproof in 30 minutes; allows reseeding or new planting after a short interval (per label).
Roundup Weed & Grass Killer₄ Refill
Brand: Roundup
Overview: This refill version provides ongoing supply for the Weed & Grass Killer₄ system. It shares the same core action—root-level weed and grass elimination with rapid results—while enabling continued, convenient use around lawns, flower beds, and hardscapes. Ensure compatibility with your existing application system and verify Floratam suitability on the label.
Key Features: Root-level weed kill; rapid results; compatible with refill systems; suitable for various outdoor areas; follow label guidance for Floratam lawns.
Buying Guide for Weed Killers on Floratam Grass
When selecting a weed killer for Floratam grass, consider weed types common to warm-season lawns, application timing, and potential impact on the turf. Floratam is a cultivar of St. Augustinegrass that thrives in southern climates but can be sensitive to certain chemicals. Here are key factors to weigh:
- Weed spectrum: Identify the weeds you want to control—dandelion, clover, crabgrass, or annual bluegrass. Some products offer broad-spectrum control; others target specific weed groups. For Floratam, select formulas labeled for Southern lawns and compatible with St. Augustine varieties.
- Mode of action: Weed killers work by systemic or contact action. Granular “weed and feed” products provide both weed control and lawn nutrition, whereas liquid concentrates or ready-to-use sprays enable quick spot treatments. Consider your yard’s weed density and preferred application method.
- Coverage and timing: Check the square footage coverage. Southern-region products often provide longer protection (up to 6 months) but require proper timing—usually during active weed growth in warm months. Avoid applying during extreme heat or drought conditions unless labeled.
- Safety and compatibility: Confirm Floratam compatibility. Some products are not recommended for Floratam or may require restricting use to non-labeled grass types. Always follow label directions, wear protective gear, and water in as directed when required.
- Residual prevention: If you’re dealing with recurring weeds, a product with residual preventive action can reduce regrowth for months. This is particularly useful in lawns with persistent weed pressure.
- Lawn health: Some products double as fertilizers, feeding the lawn while killing weeds. Balance weed control with nutrient needs to sustain a healthy Floratam lawn.
- Application equipment: Comfort Wand and similar applicators simplify precise spot treatment, reducing risk to the lawn. Ensure you have compatible equipment or purchase products that include user-friendly applicators.
Always read and follow the product label for the safest and most effective use. If you’re unsure about Floratam compatibility, test a small area first or consult local extension services for guidance tailored to your region and lawn conditions.