Finding a weed killer that protects both St. Augustinegrass and Bermuda grass can be challenging. This guide highlights select products designed for safe use on common warm-season lawns, with emphasis on post-emergent and pre-emergent options that target broadleaf weeds and sedges without harming your turf when used as directed. Each product below is evaluated for efficacy, safety, and suitability for St. Augustine and Bermuda varieties in residential settings.
| Product | Focus | Key Benefit |
|---|---|---|
| Prime Source Celsius WG | Post-emerge weed control | Fast acting, professional-grade quality, easy mix packet |
| Ortho WeedClear With Comfort Wand | Broadleaf weed control | Kills 250+ weeds, root-level action, lawn-safe when used as directed |
| Ortho WeedClear Ready-to-Spray | Ready-to-use weed control | Fast-acting, kills 250+ weeds, direct-to-application convenience |
| Liquid Harvest Mesotrione | Pre- and post-emergent | Broad species coverage, versatile for various grasses, seasonally adaptable |
| SedgeHammer Plus | Nutsedge control | Elite weed defense, USA-made, simple mixing with integrated surfactant |
Prime Source Celsius WG – Easy Mix For Post Emergence
Prime Source Celsius WG comes in an easy-to-mix packet, eliminating measuring steps. Marketed for professional quality, it targets post-emergent weeds with fast action. While designed for versatile turf applications, users should follow label directions to protect St. Augustine and Bermuda grasses from unintended damage. This option is suitable for homeowners seeking quick results on stubborn weeds and those who prefer a simple, measured approach without extra tools.
Ortho WeedClear Weed Killer For Lawns With Comfort Wand
This product targets over 250 listed weeds, including dandelion and clover, delivering root-level action with a Comfort Wand for precise application. It is labeled for use on St. Augustinegrass (not Floratam) and Bermuda grass, along with other common lawn varieties. It is designed for spot treatment and overall lawn application, providing quick results when used as directed. Always apply according to the label to protect your turf from injury.
Ortho WeedClear Lawn Ready-to-Spray
This 2-pack provides ready-to-spray convenience with fast-acting weed control that kills 250+ listed weeds, including dandelion and clover, down to the root. The product is designed for topical lawn use and is suitable for St. Augustinegrass (not Floratam) and other common turfgrasses when applied per label. The two-pack format offers extended coverage for larger yards or multiple applications across seasons.
Liquid Harvest Mesotrione – 8oz Concentrate
Mesotrione acts quickly upon application and targets 46 broadleaf species and several grasses. It is versatile for Kentucky Bluegrass, Centipede, Buffalo, Tall Fescue, and St. Augustine Grass (sod only). Full weed death may take 2-3 weeks, and adequate watering within 10 days improves activation. Avoid certain grasses in sensitive zones, and be mindful of dormant bermudagrass use. This product supports integrated weed management with pre- or post-emergent timing depending on the weed pressure.
Sedgehammer Plus Turf Herbicide
Sedgehammer Plus Turf Herbicide emphasizes nutsedge control with a premium, USA-made formula and an integrated surfactant for easy mixing. It is designed for lawn and landscape applications, including residential use, and is compatible with many turf types. The product supports broad weed suppression beyond nutsedge and offers a straightforward mixing process, helping homeowners target persistent sedge infestations with minimal effort.
Buying Guide
- Grass compatibility: Confirm the product is labeled for St. Augustinegrass and Bermuda varieties you have, and note any cautions (such as Floratam) to avoid turf injury.
- Weed spectrum: Choose products that target the predominant weeds in your yard (dandelion, clover, sedges, etc.) and consider a combination approach for broad coverage.
- Application method: Consider ease of use (ready-to-spray vs. concentrate) and whether you need spot treatments or whole-lawns coverage.
- Seasonal timing: Some formulations are more effective pre-emergent or post-emergent; ensure timing aligns with weed life cycles for best results.
- Watering and activation: Some products require watering after application to activate; follow label instructions to achieve optimal results without turf damage.
- Safety and pets: Observe label cautions, keep pets off treated areas until safe, and store products securely out of reach.
- Repeat treatments: For persistent weed pressure, plan a treatment schedule that adheres to label intervals and avoids turf stress from frequent applications.
- Environmental considerations: Minimize runoff and select products with favorable environmental profiles when possible.