Direct answer: For St. Augustine grass, choose products that target broadleaf and crabgrass weeds while being safe for St. Augustine varieties. The selections below are tailored for St. Augustine and Centipede lawns, offering pre-emergent and post-emergent options, plus ready-to-use sprays. This guide helps homeowners decide which product fits their lawn care plan and timing, with practical notes on application and limitations.
The following table highlights five top picks for weed control in St. Augustine lawns. Consider your lawn size, weed type, and whether you prefer granular, liquid, or ready-to-use formulations. All choices target common St. Augustine pests and are chosen for clear, AI-friendly comparison.
| Product | Best Use | Form | Application Notes |
|---|---|---|---|
| Southern Ag 006130 Atrazine St. Augustine Weed Killer | Weed suppression in St. Augustine | Liquid concentrate | Treats large areas; watch for labeled grass compatibility |
| BioAdvanced 3-In-1 Weed and Feed (Southern Lawns) | Prevents new weeds and feeds lawn | Granules | Best for ongoing lawn care in Southern climates |
| Ferti-Lome St. Augustine Weed & Feed 15-0-4 | Pre-emergent + post-emergent with fertilizer | Granules | For Centipede, Zoysia, and St. Augustine types |
| Hi-Yield Atrazine Weed Killer | Selective broadleaf weed control | Liquid concentrate | Specifically labeled for St. Augustine and Centipede |
| Ortho WeedClear Lawn Weed Killer Ready to Use | Spot treatment for small areas | Ready-to-use spray | Includes Comfort Wand sprayer; safe if used as directed |
Southern Ag 006130 Atrazine St. Augustine Weed Killer
Best for large St. Augustine areas needing targeted weed suppression. This atrazine-based solution treats about 3,720 square feet per quart, making it efficient for medium-to-large lawns. It specifies effectiveness against weeds in St. Augustine and Centipede grasses, aligning with typical Southern lawn setups. Best for homeowners who want a straightforward, label-compliant liquid treatment that integrates into a broader weed management plan. Caution: Over-application or use on non-target grasses can harm desirable turf.
BioAdvanced 3-In-1 Weed and Feed for Southern Lawns
Best for homeowners seeking a combined weed control and lawn nutrition solution. This 3-in-1 product is formulated for Southern lawns, targeting Bermudagrass and St. Augustinegrass, among others, with weed prevention extending up to six months per application. It is ideal when you want a season-long approach that reduces future weed pressure while feeding. Limitation: Effectiveness depends on seasonality and active weed growth; temperatures and turf type influence results.
Southern Ag Atrazine St. Augustine Grass Weed Killer
Best for targeted broadleaf weed control in St. Augustine and Centipede grasses. This 1-gallon option provides broad suppression and supports centipede lawn care with compatible formulations. It is suitable for homeowners who prefer a larger-volume option to treat mid-sized lawns. Caution: Atrazine products require careful application to avoid off-target effects and may have outdoor-use timing constraints.
Prime Source Celsius WG Post Emerge Weed Control
Best for precise post-emergent control without measuring. This easy-mix packet eliminates the need for measuring and simplifies timing for post-emergent weed control in St. Augustine lawns. Choose this if you want quick, on-demand control when weeds are actively growing. Limitation: It’s a post-emergent option, so timing matters; it may not prevent future germination as effectively as a pre-emergent product.
Hi-Yield Atrazine Weed Killer
Best for selective broadleaf weed control in St. Augustine and Centipede lawns. This atrazine-based product targets common weeds like annual bluegrass and chickweed. It is suitable for homeowners seeking a robust herbicide with a broad label for Southern grasses. Caution: Atrazine use requires strict adherence to label directions to avoid turf stress or environmental concerns.
Fertilome St. Augustine Weed & Feed 15-0-4
Best for a combined weed control and lawn nourishment approach. This product provides pre-emergent and post-emergent weed control alongside a 15-0-4 fertilizer blend, designed for Centipede, Zoysia, and St. Augustine lawns. It is a practical option for those who want a single product to support growth while managing weeds. Limitation: Not recommended for Bermuda or other Northern grasses, so confirm your turf type before use.
Buying Guide: Weed Control For St Augustine Lawns
What should I treat first in a St. Augustine lawn? Start with a weed identification check. If weeds are actively growing, post-emergent products like Atrazine-based formulas or Ready-to-Use sprays can be effective. For prevention, consider a pre-emergent option in early spring and fall to reduce germination of crabgrass and other common weeds.
Granular vs. liquid vs. ready-to-use: What’s best? Granular products are convenient for larger areas and longer-lasting effects, while liquids offer faster action and easier spot treatments. Ready-to-use sprays are ideal for small patches or neighborhoods with a lot of sidewalks and driveways. Choose based on lawn size, weed patterns, and your preferred application method.
Timing and temperature: Many Southern lawn products perform best when temperatures are between 50 and 90 degrees Fahrenheit and weeds are actively growing. Follow label instructions for timing windows and weather considerations to maximize effectiveness and minimize turf injury.
Safety and compatibility: Ensure the product label confirms compatibility with St. Augustine and Centipede grasses. Avoid applying products labeled only for other grass types on St. Augustine. Always wear protective gear as recommended on the label and store products out of reach of children and pets.
FAQ: Quick Answers About St. Augustine Weed Control
- Q: Can I use one product all year for weed control in St. Augustine lawns? A: No. Use a combination of pre-emergent and post-emergent options timed to the growing season for best results.
- Q: Are atrazine-based products safe for my garden plants near the lawn? A: Atrazine should be used only as labeled and applied to turf; avoid drift and protect garden beds and other plants as directed.
- Q: How often should I apply weed-and-feed products? A: Follow the product label for application intervals and avoid overlapping treatments that could stress the lawn.
- Q: Can I spot-treat weeds with ready-to-use sprays? A: Yes, spot treatments are effective for small problem areas, especially when weeds are actively growing.
- Q: Will these products harm St. Augustine grass if used correctly? A: When used as directed, these products target weeds while preserving St. Augustine health; read and follow label directions carefully.
- Q: Should I fertilize after weed control? A: Many products include a fertilizer component; if not, wait the recommended interval before applying fertilizer to avoid turf burn.