St. Augustine lawns demand targeted weed control and steady fertilization to stay lush and resilient. The products below are formulated for Southern grasses, including Floratam St. Augustine, and combine weed suppression with lawn feeding. This guide highlights five options, summarizes their benefits, and provides practical buying considerations to help American homeowners choose the right weed-and-feed for St. Augustine turf.
| Product | Brand | Key Benefit | Target Grass |
|---|---|---|---|
| Scotts Turf Builder Bonus S Southern Weed & FeedF2 | Scotts | Kills existing weeds and thickens grass to crowd out future weeds | St. Augustine, Floratam |
| BioAdvanced 3-in-1 Weed and Feed for Southern Lawns | BioAdvanced | 6-month weed prevention plus broad weed killer | Southern lawns including St. Augustine |
| Fertilome St. Augustine Weed & Feed 15-0-4 (25.6 lbs) | Ferti-Lome | Combined pre-emergent/post-emergent weed control with fertilizer | St. Augustine, Centipede, Zoysia |
| Southern Ag Atrazine St. Augustine Weed Killer | Southern Ag | Targeted weed killer for St. Augustine and Centipede | St. Augustine, Centipede |
| LESCO 50 lb. St. Augustine Weed And Feed | LESCO | Professional-grade slow-release feeding with weed control | St. Augustine Turf |
Notes: Not all products are interchangeable across all St. Augustine varieties. Always follow usage directions for lawn size, local climate, and water requirements after application to maximize safety and effectiveness.
Scotts Turf Builder Bonus S Southern Weed & Feed
Brand: Scotts. This weed killer plus fertilizer targets existing weeds while thickening turf to crowd out future invaders. It specifically controls dollarweed, clover, dandelion, chickweed, oxalis, henbit, purslane, and more in Florida lawns. Apply when grass and weeds are actively growing and water in promptly after application to activate the product.
What to know
- For Florida warm-season grasses including St. Augustine
- Warmer temperatures after application support weed suppression
- Water-in requirement is essential for effectiveness
Best for homeowners seeking an all-in-one solution that both eradicates existing weeds and fortifies lawn density to reduce future weed establishment.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns
Brand: BioAdvanced. This formula is tailored for Southern lawns, including St. Augustinegrass (Floratam). It offers up to six months of weed prevention while delivering lawn fertilizer to support turf health and beauty. Kills listed broadleaf and grassy weeds, helping maintain a healthy, vibrant lawn with less mowing stress over time.
What to know
- Designed for Floratam and other Southern varieties
- Long-lasting weed protection reduces seasonal weed pressure
- Balancing weed control with steady nutrient release supports growth
Ideal for homeowners who want predictable, longer-term weed management combined with regular feeding in a single product.
Fertilome St. Augustine Weed & Feed 15-0-4 (25.6 lbs)
Brand: Ferti-Lome. This product blends pre-emergent and post-emergent weed control with a 15-0-4 fertilizer mix, specifically for Centipede, Zoysia, and St. Augustine lawns. It is not recommended for Bermuda or some Northern grasses. The formula supports weed suppression and feeding in a single application, useful for late-season care and early-season growth.
What to know
- Targeted for Southern grasses including St. Augustine
- Use restrictions apply to non-Southern grass varieties
- Combines weed control with balanced fertilizer
Choose this option when you want a strong Southern-focused product that simplifies care with a combined weed-killing and feeding approach.
Southern Ag Atrazine St. Augustine Weed Killer
Brand: Southern Ag. This product comes in a 32 oz format and treats up to 3,720 sq ft per quart. It focuses on controlling weeds in St. Augustine and Centipede grasses. Its simple application is suited for homeowners who want effective weed suppression with straightforward coverage calculations and a long-standing herbicide option in warm-season lawns.
What to know
- Efficient coverage for medium-sized lawns
- Specific to St. Augustine and Centipede varieties
- Herbicide-focused with compatible fertilization separate
Useful when you need a proven weed-control option tuned for St. Augustine lawns with predictable results across typical Southern yard seasons.
LESCO 50 lb. St. Augustine Grass Weed and Feed
Brand: LESCO. A professional-grade, large-bag option designed for St. Augustine turf. It offers a slow-release feeding profile with weed control that can provide extended nutrition while addressing weeds. The product is designed to be applied when the turf is wet and allows results within about two weeks, with suitability for Floratam varieties and similar warm-season grasses.
What to know
- Low-maintenance, long feeding cycle
- Slow-release nutrients extend lawn health between applications
- Suitable for Floratam and other St. Augustine types
Best for homeowners seeking a durable, professional-grade option that provides sustained feeding alongside weed suppression over multiple weeks.
Buying Guide
Key purchase considerations help compare weed-and-feed products for St. Augustine lawns. Consider weed spectrum, local climate, and lawn size to select an option that balances weed control with turf health. Here are multiple perspectives to guide decision-making:
- Weed target: Some products focus on broadleaf weeds (dandelion, clover), while others include grassy weed prevention. If your lawn struggles with dollarweed or clover, select a product explicitly addressing those species.
- Active ingredients and timing: Pre-emergent and post-emergent combinations work best when weeds are dormant or actively growing. Follow label directions for seasonal timing and watering needs after application.
- Soil and fertilizer balance: Check N-P-K ratios. A higher first number can promote quick green-up, but slower-release formulas extend feeding across weeks. For St. Augustine, slow-release options reduce burn risk and runoff in hot climates.
- Size and coverage: Larger bags lower per-unit cost and reduce application frequency, but ensure you have enough spreader capacity to cover the area evenly.
- Safety and local guidelines: Some areas have restrictions on certain herbicides (such as atrazine). Always verify compatibility with your local regulations and the specific St. Augustine cultivar you grow.
- Watering and activation: Many products require immediate watering after application to activate weed-killing ingredients and move nutrients into the root zone. Plan irrigation accordingly.
- Long-term maintenance: For ongoing lawn health, rotate or alternate products across seasons to avoid weed resistance and to maintain soil biology.
Choosing among these options depends on your lawn’s weed pressure, your preferred maintenance cadence, and whether you want longer prevention windows or an emphasis on rapid weed kill and turf density. For a Florida-friendly approach, prioritize products designed for Southern grasses and Floratam-compatible blends. When in doubt, start with a lower-risk, slow-release formula and monitor turf response over 6–8 weeks before applying additional products.