Maintaining St. Augustinegrass and Bermuda in American yards requires weed control products that target common invaders without damaging the turf itself. The products below are designed to work on southern grasses, with active ingredients and formulations geared toward St. Augustine and bermuda varieties. This guide compares options, how they work, and key considerations to help you pick the right weed killer for your lawn care plan.
Summary of selected products:
| Product | Brand | Active/Focus | Best For | Format |
|---|---|---|---|---|
| Southern Ag Atrazine St. Augustine Grass Weed Killer | Southern Ag | Atrazine; broadleaf suppression | St. Augustine lawns with crabgrass suppression | 1 gallon |
| BioAdvanced 3-in-1 Weed and Feed for Southern Lawns | BioAdvanced | Weed killer + lawn fertilizer | Southern lawns including Bermudagrass and Floratam St. Augustine | Granules, 10 lb |
| Hi-Yield Atrazine Weed Killer | VPG | Atrazine | St. Augustine and Centipede grass | Granular |
| Ferti-Lome St. Augustine Weed & Feed (15-0-4) | ferti-lome | Pre-emergent and post-emergent weed control + fertilizer | St. Augustine and Centipede | Granular |
| Ortho WeedClear Weed Killer for Lawns Ready-to-Spray | Ortho | Broad-spectrum weed control | Kills dandelion, clover; works on multiple warm-season grasses | Ready-to-Spray |
Southern Ag Atrazine St. Augustine Grass Weed Killer
Southern Ag Atrazine St. Augustine Grass Weed Killer focuses on broadleaf weed suppression while supporting clean St. Augustine turf. Its atrazine-based formulation targets annual weeds and provides suppression of crabgrass, a common concern for warm-season lawns. The product is compatible with St. Augustine grass and can be used in various southern turf settings, including centipede grass. Application direction and timing influence effectiveness, so follow label instructions for best results.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns
This granulated product provides a dual-action approach: it feeds the lawn while acting as a weed killer for listed broadleaf and grassy weeds. It’s formulated with southern lawns in mind, including Bermudagrass and St. Augustine varieties like Floratam. The product claims up to six months of weed prevention, helping reduce new weed pressure. It’s designed to be a practical, all-in-one option for homeowners aiming to maintain color and density without extra applications.
Hi-Yield Atrazine Weed Killer
Hi-Yield Atrazine Weed Killer brings atrazine-based control to St. Augustine and centipede lawns, targeting common annual weeds. The product is offered as a granular formulation designed for even distribution in southern turf, with emphasis on controlling weed species that compete with warm-season grasses. As with all atrazine products, careful adherence to label directions is essential to avoid damage to non-target plants and to meet local regulations.
Ferti-Lome St. Augustine Weed & Feed 15-0-4
This product combines pre-emergent and post-emergent weed control with a 15-0-4 fertilizer mix. It’s designed to support Centipede, Zoysia, and St. Augustine lawns, promoting healthy growth while addressing weeds. The label advises against use on Bermuda or Northern grasses, making it more suitable for southern lawns seeking weed suppression alongside basic nutrition. As with all weed-and-feed products, timing and application rate are key to achieving the desired balance of weed control and lawn growth.
Prime Source Celsius WG – Post Emerge Weed Control
Prime Source Celsius WG is a post-emergent weed control option described as professional-grade and fast-acting. The easy-mix packet format minimizes measuring steps for the user, which can be convenient for homeowners managing southern lawns. While primarily marketed for broad weed control, users should verify compatibility with St. Augustine and Bermuda grasses in their region and follow label directions for safe and effective use.
Total Weed Killer Concentrate 32 Oz
The Central Garden & Pet concentrate is a versatile option for broadleaf weed control in established warm-season and cool-season turfgrasses. It is designed to kill a wide range of weeds from dandelion and clover to dollarweed and chickweed, with quick action noted in user listings. When applying to St. Augustine or Bermuda lawns, ensure the product is suitable for your specific grass type and follow label directions to protect the grass while targeting weeds.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns (20 lb)
This larger 20-pound bag offers the same core benefits as the 10-pound version, potentially giving longer coverage for larger lawns. It’s formulated for southern lawns—Bermudagrass and St. Augustinegrass including Floratam—and provides up to six months of weed prevention. As a weed-and-feed option, it delivers nutrients while addressing weed pressure, supporting lawn density when used according to label guidelines.
Buying Guide: Key Purchase Considerations
- Target weeds: Match the product’s label with the weeds you see—dandelion, crabgrass, dollarweed, clover, or others. Some products are broader spectrum, others are more selective.
- Grass compatibility: Verify that the product is labeled for St. Augustine and Bermuda grasses in your region. Some formulations are not suited for Bermuda, Floratam variants, or certain southern grasses.
- Application timing: Pre-emergent options prevent weed seeds, while post-emergent products control existing weeds. Decide based on weed stage and seasonal timing.
- Fertilizer content: Weed-and-feed products add lawn nutrients. Consider your soil needs and whether you require fertilizer as part of your regimen.
- Formulation and handling: Granular vs. liquid or ready-to-spray affects ease of use, coverage, and equipment needs. Easy-mix packets or concentrated sprays may simplify application.
- Environmental safety: Follow label directions to protect beneficial plants, waterways, and pollinators. Avoid overspray onto non-target areas and consider weather conditions for optimal results.
- Local regulations: Atrazine and other active ingredients can be regulated in some regions. Check local guidelines and restrictions before purchasing or applying.
- Re-entry and mowing: Many products specify re-entry intervals and mowing restrictions after application. Plan your lawn care schedule accordingly.
- Maintenance plan: Combine weed control with proper mowing height, irrigation, and seasonal feeding for lasting lawn health.
How to Use Effectively Across St. Augustine And Bermuda Lawns
Begin by identifying the primary weeds in your lawn and selecting a product labeled for St. Augustine or Bermuda. Read and follow the label for application rates, timing, and safety precautions. For pre-emergent options, apply before weed seeds germinate, typically in early spring or late summer depending on climate. For post-emergents, target visible weeds, using spot treatments when appropriate to minimize turf exposure. When using weed-and-feed products, apply evenly to ensure consistent nutrition and weed control across the lawn. Monitor results and re-treat as needed following the label’s guidelines.