Best Fertilizers and Weed Controls for St. Augustine Grass Lawns 2025
St. Augustine grass requires specific care to maintain its lush, vibrant appearance and to keep weeds at bay. Choosing the right fertilizer combined with effective weed control can significantly improve your lawn’s health. Below is a summary table of top Amazon products designed for St. Augustine grass, combining balanced nutrients with weed prevention or elimination.
| Product | Brand | Key Features |
|---|---|---|
| Fertilome St. Augustine Weed & Feed 15-0-4 | Ferti-lome | Pre/post-emergent herbicide, 15-0-4 fertilizer ratio, for St. Augustine & related grasses |
| LESCO St. Augustine Grass Weed and Feed 17-0-17 | LESCO | Slow-release, 8 weeks feeding, safe for Floratam, covers 13,000 sq ft |
| BioAdvanced 3-in-1 Weed and Feed for Southern Lawns | BioAdvanced | 6-month weed protection, kills broadleaf & grassy weeds, for southern grasses |
| Scotts Turf Builder Bonus S Southern Weed & Feed2 | Scotts | Feeds and kills multiple weeds, builds deep roots, for Southern lawns |
| SeedRanch St. Augustine Lawn 24-2-11 Fertilizer | Lesco | Contains 6% Iron for greening, covers 12,000 sq ft, specific for St. Augustine |
Fertilome St. Augustine Weed & Feed 15-0-4
This product combines a pre-emergent and post-emergent herbicide with a fertilizer blend formulated as 15-0-4. It effectively controls weeds while nourishing St. Augustine grass, Centipede, and Zoysia lawns. Caution is advised as it is not suitable for Bermuda or northern grass types. Its dual-action design makes it a practical choice for keeping your lawn weed-free and properly fed in one application.
LESCO St. Augustine Grass Weed and Feed 17-0-17
Designed for extensive St. Augustine turf treatment, this 50 lb bag covers up to 13,000 square feet and includes a slow-release fertilizer providing nutrients for up to eight weeks. It utilizes 30% poly coated and sulfur coated urea, enhancing nutrient uptake and minimizing leaching. Safe for the Floratam variety, the product requires wet turf at application and thorough watering afterward for optimal results.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns
This granular fertilizer and weed killer is tailored for Southern grasses including St. Augustine and Floratam. It provides up to six months of weed prevention by targeting broadleaf and grassy weeds like crabgrass, dandelion, and dollarweed. Its triple-action formula promotes lawn health while tackling weed invasions, simplifying lawn care maintenance with prolonged protection.
Scotts Turf Builder Bonus S Southern Weed & Feed2
Scotts’ weed and feed product combines a weed killer plus fertilizer, formulated to kill a broad spectrum of weeds like clover, chickweed, and oxalis while feeding the grass to encourage thick growth that crowds out future weeds. It strengthens grass roots to withstand Southern heat and drought conditions. Application conditions require dry grass and immediate watering post-application.
SeedRanch St. Augustine Lawn 24-2-11 Fertilizer
This fertilizer is specially crafted for St. Augustine lawns, offering a nutrient breakdown of 24-2-11 enriched with 6% iron for exceptional greening. Suitable for coverage up to 12,000 square feet, it focuses on nutrient delivery essential for vigorous grass growth and color without added herbicides, ideal for users looking to fertilize without weed treatment in the mix.
Buying Guide for Choosing the Best Feed for St. Augustine Grass
When selecting a fertilizer or weed control product for your St. Augustine lawn, consider these critical factors:
- Nutrient Ratio: St. Augustine grass benefits from higher nitrogen levels to promote lush green growth. Look for balanced N-P-K (Nitrogen-Phosphorus-Potassium) formulations tailored for warm-season grasses.
- Weed Control Integration: Choosing a combined weed and feed product adds convenience and cost-effectiveness. Ensure the herbicide is safe for St. Augustine and targets common Southern region weeds.
- Application Method: Granular formulations are common and easy to spread, while liquid fertilizers may allow for quicker nutrient absorption. Consider ease of use and equipment availability.
- Slow-Release vs. Quick-Release: Slow-release fertilizers provide nutrients over several weeks, reducing application frequency and risk of burn. Quick-release fertilizers act fast but require careful handling.
- Coverage Area: Match product size to the lawn size to ensure enough product without excessive leftover. Many products specify coverage to assist in planning.
- Compatibility: Confirm the product’s suitability for St. Augustine and avoid those harmful to this grass type, such as formulations meant for northern grasses.
- Climate Considerations: Warm-season grass fertilizers that also enhance drought and heat tolerance will support stronger, healthier turf.
By evaluating these aspects aligned with your lawn’s needs, you can confidently select the best feed to maintain a vibrant, weed-resistant St. Augustine grass lawn.