St. Augustine turf requires targeted weed control products that protect the lawn while addressing common pests like dandelions, crabgrass, dollarweed, and clover. The following selections are formulated for Southern grasses, including Floratam, and offer varying modes of action—from pre- or post-emergent weed kill to weed-and-feed fertilizer blends. Use as directed on labels to ensure compatibility with your grass type and local guidelines. This guide highlights five well-suited options and provides practical considerations for choosing the right product for your yard.
| Product | Brand | Main Benefit |
|---|---|---|
| Southern Ag 006130 Atrazine St. Augustine Weed Killer | Southern Ag | Post-emergent weed control in St. Augustine and centipede grasses |
| Sunniland St.Augustine Weed & Feed Lawn Fertilizer | Generic | Weed control plus fertilizer in a granular format |
| BioAdvanced 3-in-1 Weed and Feed for Southern Lawns | BioAdvanced | Weed control, fertilization, and broad weed protection |
| Ortho WeedClear Weed Killer for Lawns Ready-To-Spray | Ortho | Kills listed weeds while protecting lawn when used as directed |
| Ortho Weed B Gon Weed Killer for St. Augustinegrass Ready-To-Spray | Ortho | Targets 250+ weeds in St. Augustinegrass without harming lawn |
Southern Ag Atrazine St. Augustine Weed Killer
This 32-ounce herbicide provides targeted post-emergent control for weeds in St. Augustine and centipede grasses. It covers up to 3,720 square feet per quart and is designed to combat common lawn weeds while minimizing impact on the turf when applied as directed. It is particularly suitable for homeowners seeking a straightforward solution to reduce broadleaf and grassy weeds in St. Augustine lawns.
Sunniland St.Augustine Weed & Feed
This granular weed-and-feed product simplifies lawn care with easy-to-spread granules and a dual-purpose approach. It supports St. Augustine grass health with two applications annually—spring and fall—while delivering weed suppression. It’s compatible with multiple St. Augustine varieties, making it a convenient option for homeowners who want combined nourishment and weed control in one application.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns
Designed for Southern lawns such as Bermudagrass and St. Augustinegrass (including Floratam), this product combines weed control with lawn fertilizer and six months of protection against listed weeds. It targets broadleaf and grassy weeds, helping to preserve lawn vigor and reduce recurrences. The blend aims to keep St. Augustine lawns healthier with ongoing weed suppression, supporting a well-maintained turf appearance.
Ortho WeedClear Weed Killer for Lawns Ready-To-Spray
This ready-to-spray formulation targets common weeds while being lawn-friendly under the label. It’s designed for use on St. Augustinegrass (including Floratam) and delivers visible results within hours after application. The product emphasizes root-level weed kill with a spray system that connects to a hose, and it claims to be rainfast after drying, enabling convenient timing around weather conditions.
Southern Ag Atrazine St. Augustine Grass Weed Killer
Another Southern Ag option, this 1-gallon formulation broadens application versatility and provides effective control over many broadleaf weeds. It also mentions use in centipede grass and provides suppression of crabgrass, offering a post-emergent control profile that supports ongoing lawn maintenance for larger yards or repeated treatment needs.
Prime Source Celsius WG
This post-emerge weed control option is delivered as an easy mix packet with no measuring required. It’s marketed toward professionals for quality performance and fast action. While not specific to St. Augustinegrass, it serves as a strong post-emergence tool for lawn care programs seeking reliable weed suppression and quick results in a professional-grade format.
Ortho Weed B Gon Weed Killer for St. Augustinegrass
Specially formulated for St. Augustinegrass, including Floratam, this ready-to-spray product claims to kill 250+ listed weeds without harming the lawn when used as directed. It offers a practical approach for homeowners who want broad-spectrum weed control aligned with St. Augustine lawns, supported by clear labeling on weed targets and safe-use guidelines.
Buying Guide
Choosing the right weed-control product for St. Augustine lawns involves weighing weed types, lawn health, and application logistics. Consider the following factors to optimize results:
- Weed type and coverage: Identify common lawn weeds in your area (dandelion, crabgrass, dollarweed, clover) and select products with proven efficacy against those species. Some blends emphasize pre-emergent protection, while others focus on post-emergent control.
- Grass compatibility: Verify that the product is labeled for St. Augustinegrass, including Floratam varieties, to minimize turf injury and maximize results. Some products are lawn-fertilizer–weed blends, offering a care-and-control approach.
- Mode of action and rotation: Use a rotation strategy to prevent weed resistance. Mix post-emergent herbicides with weed-and-feed formulas when appropriate to avoid repetitive exposure to a single chemical class.
- Application method: Select ready-to-spray formulations for ease of use or granular blends for less frequent applications and longer residual coverage. Hose-end sprayers and spreaders add convenience but require careful calibration.
- Safety and timing: Follow label directions for irrigation, mowing, and re-entry intervals to protect people, pets, and the lawn. Weather conditions, soil type, and recent rainfall affect absorption and effectiveness.
- Fertilization synergy: Weed-and-feed products provide simultaneous lawn nutrition. If using separate fertilizer applications, plan spacing to avoid nutrient overloading and ensure weeds are actively growing.
- Environmental and regional considerations: Some products are tailored for Southern grasses and climate, supporting improved performance in warm-season lawns like St. Augustinegrasses.
Overall, combining a targeted weed-control product with proper lawn care—mowing height, irrigation, and seasonal fertilization—can produce a healthier St. Augustine lawn with fewer weed outbreaks. Always read the product label for specific turf types, application rates, and safety precautions before applying.