Best St. Augustine Grass Weed and Feed Fertilizer for a Lush Lawn
If you’re managing a St. Augustine lawn, a weed-and-feed fertilizer tailored for southern grasses can simplify care and improve results. This guide highlights five compatible products, explaining who benefits most from each option and why they stand out for St. Augustinegrass and Bermudagrass lawns. Use the buying guide and FAQ to compare features like weed control scope, feeding duration, and application requirements to pick the right product for your yard.
| Product | Best For | Approx. Coverage | Notes |
|---|---|---|---|
| BioAdvanced 3-In-1 Weed and Feed Granules (10 lb) | Smaller to mid-sized southern lawns needing broadweed control | Small to medium areas | Prevents new weeds up to 6 months |
| LESC0 50 lb St. Augustine Grass Weed and Feed | Large St. Augustine or Floratam-friendly lawns | Large areas | Slow-release for up to 8 weeks |
| Scotts Turf Builder Southern Lawn Food | Lawn care for mixed southern grasses | Up to 5,000 sq ft | Pet- and family-friendly after application |
| Spectracide Weed & Feed 20-0-0 (3 Count) | Weed-heavy southern lawns | Household-sized spaces | Kills broadleaf weeds while feeding |
| The Andersons Premium Weed and Feed (18 lb) | Fast green-up with extended feeding | Up to 5,000 sq ft | Includes both quick- and slow-release nitrogen |
BioAdvanced 3-In-1 Weed and Feed Granules (10 lb) — Southern Lawns
Best for: Small to medium southern lawns needing broad weed control plus feeding. This product targets common southern weeds and offers up to six months of preemption against new weed growth. It’s formulated with a schedule that fits temperatures between 50 and 90 degrees and actively growing weeds, making it a straightforward option for routine lawn care. Select this if you want a compact bag that mixes weed control with nutrition in one application.
Why chosen: It combines weed kill with feeding and weed prevention in a 3-in-1 formula suitable for Bermudagrass and St. Augustinegrass found in southern lawns. The 6-month prevention window helps reduce frequent re-treatments in typical growing seasons. Caution: Avoid applying during extreme heat or drought stress when weeds aren’t actively growing.
LESC0 50 lb St. Augustine Grass Weed and Feed
Best for: Large St. Augustine lawns that require slow-release feeding and sustained weed management. This product is designed specifically for St. Augustine turf and Floratam varieties, with a formulation that supports longer feeding windows and gradual green-up. Choose this if you have a big yard and want less frequent applications.
Why chosen: It provides slow-release feeding that can extend results over weeks, helping reduce maintenance frequency. Caution: Apply when turf is wet, then allow it to dry before mowing or heavy use to prevent fertilizer run-off and potential burn on sensitive patches.
Scotts Turf Builder Southern Lawn Food
Best for: Lawns with southern grasses needing a balanced feeding program without specialized weed killers. This product is pesticide-free and suitable for spring, summer, or fall applications, making it versatile for year-round maintenance in warm climates. It is a solid choice when you want a reliable fertilizer base for the lawn.
Why chosen: Its southern-focused formula supports robust growth for St. Augustine and Bermudagrass with user-friendly application timing. Caution: It does not include broadleaf weed control; pair with a weed-control strategy if many broadleaf weeds are present.
Spectracide Weed & Feed 20-0-0 (3 Count)
Best for: Lawns with significant broadleaf weed pressure and a need for concurrent feeding. The dual-action formula kills major broadleaf weeds while delivering nitrogen to the turf, helping with quick green-up after application. Choose this if you prefer a prescriptive weed control alongside nourishment.
Why chosen: It directly targets common southern broadleaf weeds such as dandelion, chickweed, and clover, which are frequent in St. Augustine lawns. Caution: It is a 20-0-0 formulation; ensure it aligns with the lawn’s current nutrient status to avoid excessive nitrogen at once.
The Andersons Premium Weed and Feed (18 lb)
Best for: Lawns seeking a fast green-up while maintaining longer feeding cycles. This product blends quick- and slow-release nitrogen to provide both rapid appearance improvement and extended nourishment. Suitable for moderate-to-large areas where weed control and lawn feeding must be balanced in a single product.
Why chosen: The combination of immediate greening and prolonged feeding helps reduce maintenance visits and supports steady growth. Caution: Be aware of any local regulations on herbicide use if you have sensitive plantings nearby or specific environmental concerns.
Buying Guide: Key Purchase Considerations
What should a buyer look for in a St. Augustine weed-and-feed product? Consider weed targets, turf compatibility, feeding duration, and application timing. For St. Augustine lawns, select formulas labeled for southern grasses and specifically mention St. Augustinegrass or Floratam as acceptable turf types. If you need long-lasting prevention, choose products advertising weed prevention that lasts several months. For large yards, prioritize high coverage or bulk bags. If your lawn has heavy weed pressure, a dual-action formula that both kills weeds and feeds the lawn is advantageous. Always follow label directions for temperature windows and watering guidance to maximize safety and effectiveness.
Frequently Asked Questions
- What is the best time to apply weed-and-feed on St. Augustine grass? Apply when weeds are actively growing and temperatures fall within the product’s recommended range, typically during mild spring or fall periods.
- Can I use these products on Bermudagrass as well? Yes, many southern lawn formulas are suitable for Bermudagrass, but check the label for turf compatibility to avoid damage on non-target grasses.
- Do these products prevent future weeds? Some formulations advertise weed prevention for up to 6 months after a single application, depending on product and weather conditions.
- How long should I wait before mowing after application? Wait the recommended time on the product label, usually at least 24 hours, to prevent fertilizer burn and ensure proper uptake.
- Are these products safe for pets? Many southern lawn formulas are labeled as safe once fully watered in and dried, but always check the label for pet-related usage, waiting periods, and restricted areas.
- What should I do if I have a lot of broadleaf weeds? Choose a product specifically advertised to kill broadleaf weeds or combine a weed-killer with a feed product to target broadleaf species efficiently.