Keeping St Augustinegrass and Bermuda grasses weed-free requires products that target common lawn weeds while minimizing damage to these sensitive turf types. The following roundup of select weed killers blends classic post-emergent control with pre-emergent options and targeted formulations. Each product below is evaluated for compatibility with St Augustine and Bermuda lawns based on labeled usage and typical homeowner applications.
| Product | Brand | Formulation Type | Typical Use |
|---|---|---|---|
| Prime Source Celsius WG | Prime Source | Post-emerge, WG | Active on many broadleaf and grassy weeds |
| Ortho WeedClear with Comfort Wand | Ortho | Liquid Weed Killer | Lawn-wide control, fast acting |
| Ortho WeedClear Ready-to-Spray | Ortho | Ready-to-Spray Weed Killer | Convenient single-application option |
| Liquid Harvest Mesotrione | Liquid Harvest | Post- and pre-emergent, concentrate | Broadleaf and grassy weed control |
| Sedgehammer Plus Turf Herbicide | SEDGEHAMMER | Nutsedge-focused | Nutsedge and select weeds |
Note: Always follow label directions for your specific grass type and region. For St Augustinegrass, avoid products labeled only for Floratam varieties, unless the label specifies safe use on the variety you have. For Bermuda, apply only where allowed and observe weather and re-entry intervals. When in doubt, perform a small test spot before full-scale treatment.
Prime Source Celsius WG – Easy Mix Weed Control
Prime Source Celsius WG is a post-emergent weed control option designed for professional-grade results with an easy-to-use mix packet. The formulation is promoted as fast-acting and suitable for professional turf settings, offering a no-measuring requirement via premixed packets. While labeled for various turf types, homeowners should verify compatibility with St Augustine and Bermuda grass. This product emphasizes quick weed kill and broad-spectrum effectiveness, making it a potential option for rapid restoration of weed-free turf.
Ortho WeedClear Weed Killer for Lawns with Comfort Wand
Ortho WeedClear with Comfort Wand targets over 250 listed weeds, including dandelion and clover, while aiming to protect the lawn when used as directed. It offers fast-acting control and is suitable for St. Augustinegrass (not Floratam) and several other cool- and warm-season grasses. The Comfort Wand enables precise spot-treat applications, reducing exposure to desirable turf. This option is well-suited for homeowners seeking a balance of efficacy and ease of use in a typical home lawn setting.
Ortho WeedClear Weed Killer for Lawns Ready-to-Spray
This Ready-to-Spray variant provides a convenient, two-bottle approach with pre-measured convenience for lawn-wide weed control. It claims to kill over 250 weeds, including dandelion and clover, and is designed to act quickly with full effectiveness in a single application when used as directed. It is suitable for a range of grasses, including St Augustinegrass (not Floratam) and Bermuda varieties. Homeowners can appreciate the quick spray-on, spray-off simplicity for routine maintenance.
Liquid Harvest Mesotrione – 8oz
Mesotrione is a potent herbicide that targets a broad spectrum of broadleaf and some grassy weeds. It starts working soon after application, though full weed death may take 2–3 weeks, with activation requiring adequate moisture. It suits Kentucky Bluegrass, Centipede, Buffalo, Tall Fescue, Fine Fescue, and St. Augustine Grass (sod only). It avoids certain grasses and dormant bermudagrass. This concentrate can be used pre- and post-emergence, offering flexibility for integrated lawn weed management programs.
Sedgehammer Plus Turf Herbicide – 2 Pack
Sedgehammer Plus Turf Herbicide defends against nutsedge and up to 25 additional challenging weeds, with a dry, non-ionic surfactant included for easier mixing. It is made in the USA and marketed for small-scale residential use, offering a straightforward mix-and-apply workflow. The product emphasizes lawn safety and targeted control, particularly for nutsedge, which is a common problem in St Augustine and Bermuda lawns.
Ortho WeedClear Weed Killer for Lawns with Trigger Sprayer
This Ortho product combines a broad weed-killing spectrum with a trigger sprayer for precise application. It claims rapid, rainproof action within about an hour and effectiveness in a single application when used as directed. Approved for St. Augustinegrass (not Floratam), Bermudagrass, and several other grass types, it provides a practical option for those who need quick results with minimal effort.
Sedgehammer Herbicide – 1.33oz
This single-dose bottle targets nutsedge and can be used in established lawns, ornamentals, and landscapes. It claims soil-penetrant action, suppresses green kyllinga, and is suitable for residential and larger-area use. The product emphasizes versatility across various turf settings, including roadsides and golf courses, with a focus on reliable nutsedge control.
Buying Guide: Key Purchase Considerations and Comparisons
- Weed spectrum: Check whether the product targets your primary weed species (dandelion, clover, nutsedge, crabgrass, etc.) and whether it is labeled for St Augustine and Bermuda grasses.
- Application method: Choose based on your preference for ready-to-use sprays, wand applicators, or premixed packets. Consider spot-treat vs. whole-lawn applications.
- Grass compatibility: Verify label restrictions for St Augustinegrass (and if Floratam is present) and Bermuda varieties. Some products caution against Floratam or require dormant bermudagrass.
- Onset and duration: Some products act quickly, while others require weeks to show full effect. Consider your tolerance for a slower-acting option if it yields broader spectrum control.
- Safety and maintenance: Look for pet and human-traffic re-entry intervals, weather requirements (rainfast windows, activation moisture), and whether the product is safe for residential use.
- Surfactants and mixing: Some formulations include surfactants; others require separate additives. Premixed packets offer convenience but confirm label compatibility with your grass type.
When selecting a weed killer for St Augustine or Bermuda lawns, prioritize products with clear labeling for your grass variety and the specific weed challenges you face. For broader weed control with ease of use, Ready-to-Spray or Comfort Wand variants provide quick, accurate coverage. For targeted issues like nutsedge, Sedgehammer products offer focused action. Always conduct a spot test and follow label directions to minimize turf stress and maximize weed suppression over time.