Choosing the right fertilizer and weed killer for St. Augustine grass can be tricky due to the variety of weed species and seasonal needs. The following picks are tailored to St. Augustine lawns, including Floratam, and balance weed control with feeding. This guide highlights products that control common weeds, support growth, and fit typical Southern climate conditions. Use the selections that best match your lawn size and weed pressures for a healthier, more resilient yard.
| Product | Best For | Coverage |
|---|---|---|
| Scotts Turf Builder Southern Triple Action | Weed control, fire ant prevention, lawn feeding | 8,000 sq. ft. |
| Southern Ag Atrazine St. Augustine Weed Killer | Selective weed control in St. Augustine | 3,720 sq. ft. |
| Scotts Turf Builder WinterGuard Fall Weed & Feed3 | Fall weed control and feeding | 4,000 sq. ft. |
| Sunniland St. Augustine Weed & Feed Lawn Fertilizer | Spring and fall application, easy spread | 5,000 sq. ft. |
| LESCO St. Augustine Weed And Feed | Professional-grade weed/feeding for St. Augustine | Up to 17,000 sq. ft. |
Scotts Turf Builder Southern Triple Action
Scotts Turf Builder Southern Triple Action delivers a three-in-one formula designed for Southern lawns. It targets listed weeds while preventing and killing fire ants and providing essential lawn fertilizer to strengthen turf against heat and drought. The product claims control and prevention for multiple pests, including armyworms and ticks, for up to six months, making it a practical option for St. Augustinegrass, Floratam varieties, and related southern grasses. The blend supports growth during hot seasons and helps resist common stressors associated with Florida and Gulf Coast climates.
Key features include: killing listed weeds, preventing fire ants, feeding and strengthening the lawn, and providing extended protection for heat and drought stress. It’s suitable for St. Augustinegrass (including Floratam), Centipedegrass, Zoysiagrass, and Carpetgrass, and covers up to 8,000 sq. ft. It combines weed control with fertilization for a convenient, all-in-one treatment.
Southern Ag Atrazine St. Augustine Weed Killer
Southern Ag Atrazine St. Augustine Weed Killer is a focused herbicide designed for St. Augustine and Centipede lawns. Each quart treats a broad area, making it a cost-effective option for control of many common lawn weeds. Atrazine-based products are known for their effectiveness on broadleaf and grassy weeds in southern turf while generally allowing continued lawn growth under proper usage. This offering is compact enough for smaller to mid-size lawns and can be integrated into a broader seasonal plan for St. Augustinegrass.
Considerations include: suitability for St. Augustine and Centipede grasses, coverage per treatment, and the need to follow label instructions for safe and effective use. The product is lightweight, making it easier to store and apply in targeted applications as part of an ongoing weed management strategy.
Scotts Turf Builder WinterGuard Fall Weed & Feed3
Scotts Turf Builder WinterGuard Fall Weed & Feed3 provides a fall weed killer plus fertilizer formulation designed to prepare St. Augustine grass for the next spring. It targets over 50 listed weeds, including common clover and dandelion varieties, while feeding the lawn to support healthy growth as temperatures cool. Applying the product when weeds are actively growing and temperatures are in a suitable range ensures better results. This option is especially useful for autumn lawn care routines in southern climates where winter stress is a concern.
Important notes include: timing for fall applications, coverage of 4,000 sq. ft., and the balance between weed control and feeding to help prevent early-season weed resurgence in spring. The product is compatible with St. Augustine grass types and similar warm-season turf, providing a practical seasonal solution.
Sunniland St.Augustine Weed & Feed
Sunniland St. Augustine Weed & Feed is a straightforward option for St. Augustine lawns, offering easy-to-spread granules and user-friendly handling. With two applications recommended—one in spring and one in fall—it aligns well with typical growth cycles of warm-season grasses. The formulation is designed to work across multiple St. Augustine varieties, simplifying maintenance goals for homeowners and property managers seeking predictable weed control and nutrient delivery without complex steps.
Considerations include application timing, coverage per bag, and compatibility with Floratam-based or similar St. Augustine varieties. The product’s simplicity can be advantageous for homeowners prioritizing ease of use in grassy landscapes with moderate weed pressure.
LESCO 50 lb. St. Augustine Weed And Feed
LESCO 50 lb. St. Augustine Weed And Feed is a professional-grade option designed for larger lawns and complex care programs. The 17-0-17 mix supports St. Augustine grass with a slow-release formula intended to provide up to eight weeks of feeding. It includes sulfur-coated urea and poly-coated materials to improve distribution and soil interaction, with a formulation described as safe for Floratam varieties when used as directed. This product is aimed at professionals or serious enthusiasts managing expansive areas and seeking steady feeding alongside selective weed control.
Key points include: coverage up to 17,000 sq. ft., slow-release feeding, and a composition tailored for St. Augustine turf. Proper application wetting and timing can optimize results for improved lawn density and weed suppression over time.
Spectracide Weed Stop For Lawns For St. Augustine & Centipede
Spectracide Weed Stop For Lawns concentrates on weed control for St. Augustine and centipede lawns. The formula is designed to kill weeds while minimizing harm to the lawn when used as directed and includes atrazine for effective lawn weed management. This option is suited for homeowners seeking a reliable, ready-to-use concentrate that supports weed suppression across common lawn invaders without a heavy emphasis on fertilizer delivery. It’s useful for seasonal weed pressures in warm-season lawns and can be integrated into broader spring and summer care routines.
Considerations include: compatibility with St. Augustine varieties, weed spectrum, and adherence to label directions to minimize risk to the lawn. The concentrate format facilitates targeted treatments and can be a good companion to fertilizer-focused products in a lawn care plan.
Ortho WeedClear Lawn Weed Killer (Comfort Wand)
Ortho WeedClear Lawn Weed Killer with Comfort Wand provides broad-spectrum weed control for lawns, including many common broadleaf and grassy weeds. The product claims fast-acting results with a single application and is suitable for spot treatments on St. Augustinegrass (not Floratam) and other common lawn types. It’s designed to kill weeds down to the root while preserving lawn health when used as directed, making it a practical option for targeted weed challenges or for use alongside a general fertilizer program.
Important considerations are the applicability to St. Augustine varieties, ease of application with the Comfort Wand, and the need to follow timing guidelines tied to weed growth and lawn moisture levels.
Ortho WeedClear Lawn Weed Killer With Comfort Wand (1 Gal)
This Ortho WeedClear option comes in a 1-gallon ready-to-use format with the Comfort Wand for precise spot treatments. It kills over 250 listed weeds, including dandelion and clover, down to the root when used as directed, while minimizing harm to the lawn. It supports a broad range of warm-season grasses, including St. Augustinegrass varieties, and offers a flexible approach for homes needing effective weed control without a heavy reliance on systemic measures. It is particularly suitable for larger properties that require simple, re-applicable solutions during peak weed seasons.
Buying Guide: Key Purchase Considerations For St. Augustine Lawns
- Weed spectrum: Identify which weeds you encounter most (dandelion, clover, crabgrass, sedges) and choose products that target those species. Some formulas emphasize broad-spectrum control, while others focus on key weeds common to St. Augustine lawns in your region.
- Seasonal timing: Fall and spring weed programs differ from summer maintenance. Fall weed and feed options help prepare turf for winter and strengthen spring growth, while spring-focused products target early weed emergence.
- Fertilizer balance: If the lawn is nutrient-deficient, a product with balanced nitrogen and other nutrients supports recovery and growth. Slow-release formulations can provide ongoing feeding with fewer applications.
- Fire ant and pest management: Some combinations include fire ant prevention or pest suppression. Consider if your lawn has persistent ant issues or other pests alongside weeds.
- Grasses compatibility: Ensure the product is labeled for St. Augustine grass (including Floratam) to avoid damage or ineffective results. Some products are specifically recommended for Floratam varieties.
- Coverage and application: Check bag or bottle coverage per treatment and adjust your plan for lawn size. Professional-grade products may cover larger areas but require careful handling.
- Safety and environment: Follow label directions for safe application, protect surrounding plants, and consider weather conditions to maximize efficacy and minimize runoff.
- Storage and handling: Some products come in large bags suitable for bigger lawns, while others are concentrates or ready-to-use sprays. Choose based on your lawn size and storage space.
- Long-term lawn health: Favor products that balance weed suppression with turf feeding to maintain density and resilience rather than relying solely on chemical control.