Maintaining a healthy St. Augustine lawn means balancing weed control with steady feeding. The right weed and feed product targets common lawn invaders like crabgrass, dandelion, and clover while delivering essential nutrients to keep your turf thick and green. Below are five well-regarded options that work specifically with St. Augustine grass types, including Floratam, and are commonly available on Amazon. This guide highlights what each product does, how to apply it, and practical considerations to help you choose the best fit for your yard.
| Product | Brand | Focus | Key Benefit |
|---|---|---|---|
| Fertilome (13915) St. Augustine Weed & Feed 15-0-4 | ferti-lome | Pre-emerge & post-emerge weed control | Balanced for Centipede, Zoysia, and St. Augustine |
| Sunniland Weed & Feed 20-0-6 Lawn Fertilizer | Generic | Weed control + fertilization | Easy to spread; spring & fall applications |
| Southern Ag 006130 Atrazine St. Augustine Weed Killer | Southern Ag | Herbicide for St. Augustine and Centipede | Treats large areas; targeted weed suppression |
| BioAdvanced 3-in-1 Weed and Feed for Southern Lawns | BioAdvanced | Weed prevention + feeding | Broad compatibility with Floratam and other southern grasses |
| LESCO 50 lb. St. Augustine Grass Weed and Feed | LESCO | St. Augustine-specific formula | Slow release, extended feeding; Floratam tolerant |
Note: The above products are selected to address common St. Augustine weed pressures while delivering nutrients to support lawn health. Always read and follow the product label for application rates, timing, and any turf restrictions.
Fertilome (13915) St. Augustine Weed & Feed 15-0-4
The Fertilome product is designed as both a weed manager and a lawn food. It combines a 15-0-4 fertilizer mix with active ingredients intended for pre-emergent and post-emergent weed control. It is especially formulated for St. Augustine, Centipede, and Zoysia grasses, and not suitable for Bermuda or other Northern grasses. This makes it a targeted option for southern lawns where Floratam and related St. Augustine varieties predominate. Application guidance emphasizes avoiding Bermuda grass and nearby incompatible species.
Key features:
– Pre-emergent and post-emergent weed control
– 15-0-4 nutrient profile
– Labeled for St. Augustine, Centipede, Zoysia
– Not recommended for Bermuda or other Northern grasses
Sunniland Weed & Feed 20-0-6 Lawn Fertilizer
Sunniland Weed & Feed combines weed control with lawn nutrition in a simple granule format. This product is designed to be easy to spread and handle, with two applications recommended each spring and fall. It is suitable for all St. Augustine grass types, delivering a balanced approach to weed suppression and nutrient supply. The 20-0-6 formulation provides higher phosphorus and potassium relative to nitrogen, which can support root development and overall turf resilience during seasonal transitions.
Key features:
– Easy-to-spread granules
– Two applications per year (spring and fall)
– Suitable for all St. Augustine grasses
– 20-0-6 formulation for balanced nourishment
Southern Ag 006130 Atrazine St. Augustine Weed Killer
Southern Ag’s Atrazine-based product targets broad weed suppression in St. Augustine lawns. The quart-sized bottle treats substantial areas, with a focus on controlling weeds common to southern turf types. Atrazine remains effective for many warm-season grasses, including St. Augustine, but users should follow label directions for safe use and environmental considerations. This option provides targeted weed control while minimizing disruption to the lawn’s overall health when applied correctly.
Key features:
– Atrazine-based weed control
– Treats up to 3,720 sq ft per quart
– Effective on St. Augustine and Centipede grasses
– Package weight and handling notes on label
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns
BioAdvanced’s 3-in-1 formulation is designed for southern lawns, including St. Augustinegrass such as Floratam. It combines weed control with feeding and an extended protection timeline. The product claims up to six months of weed prevention, with activity against broadleaf and grassy weeds like crabgrass. This makes it a practical option for homeowners seeking a longer window of protection between applications while maintaining lawn vigor.
Key features:
– Targeted for Floratam and other St. Augustine varieties
– Up to 6 months of weed prevention
– Kills listed broadleaf weeds and some grassy weeds
– Suitable for southern lawns with general weed challenges
LESCO 50 lb. St. Augustine Grass Weed and Feed
LESC O’s 50-lb formulation is designed for professional-grade application with a focus on St. Augustine grass. It features a high-quality slow-release urea coating and a balanced nutrient profile intended to sustain turf health while delivering weed suppression. The product is specifically noted for Floratam compatibility and extended feeding over weeks. Application timing often aligns with wet conditions for effective uptake, followed by drying and observation of results within a two-week period.
Key features:
– Slow-release feeding for up to 8 weeks
– Specially formulated for St. Augustine and Floratam varieties
– Large 50 lb bag suited for larger yards
– Requires turf to be wet at application and to dry afterward
BioAdvanced 5 In 1 Weed and Feed
BioAdvanced’s 5 In 1 weed and feed provides broad weed control along with lawn feeding. This product is designed to address a wider spectrum of weeds and includes prevention features to curb new weed growth. While labeled for southern lawns, this option is versatile for various St. Augustine cultivars. The formulation emphasizes visible improvement within a relatively short period after application, with ongoing protection as plants recover from weed pressure.
Key features:
– 5-in-1 approach: weed control, prevention, and feeding
– Targeted for southern lawns including St. Augustine
– Broad spectrum weed control with visible early results
– Suitable for ongoing lawn health and resilience
Buying Guide: Key Purchase Considerations
When selecting a weed and feed product for St. Augustine lawns, consider these factors to optimize results and minimize turf stress.
- Weed spectrum: Identify the most common weeds in your area—crabgrass, dandelion, clover, chickweed—and choose a product with proven efficacy against those species. Some formulations emphasize broadleaf control, while others include grassy weed targets.
- Nitrogen and nutrient balance: St. Augustine turf often benefits from balanced or slightly higher potassium levels to support drought tolerance and overall vigor. Look for formulations like 15-0-4 or 20-0-6 that align with your lawn needs and regional soil conditions.
- Pre-emergent vs post-emergent: Pre-emergent components prevent seed germination, while post-emergents tackle existing weeds. For lawns with established weed pressure, a product with both modes can provide comprehensive control, but always follow label directions for timing to avoid harming the lawn.
- Florida Floratam and regional varieties: Some products highlight compatibility with Floratam and other St. Augustine strains. If you know your cultivar, prioritize products explicitly labeled for St. Augustine or Floratam to reduce risk to your turf.
- Application timing: The best results often come from applying during optimal windows in spring and/or fall when weeds are actively growing and the turf can assimilate nutrients. Avoid high heat or drought stress periods without adequate irrigation.
- Safety and usage guidelines: Always read the label for application rates, environmental warnings, and bag or bottle instructions. Ensure pets and children are kept away during and after application as required by the product.
- Yard size and coverage: Consider the product’s coverage area and whether you need multiple bags or a large-bag formulation for a bigger lawn. This affects cost-effectiveness and scheduling of applications.
- Soil health and irrigation: Some products require watering in after application. Plan irrigation accordingly to maximize nutrient uptake and weed control performance while avoiding runoff.
Integrating these products into a regular lawn care routine can help maintain a dense, weed-resistant St. Augustine lawn. Always tailor choices to your regional climate, soil conditions, and the specific needs of your grass variety.