For St. Augustine lawns, selecting the right combination of fertilizer and selective weed control is essential. This guide features five products that fit different needs—from weed control in St. Augustine and centipede grasses to nutrient-rich feeds that support southern turf. Best for homeowners seeking clear, walkway-friendly applications, these picks balance weed suppression with lawn nourishment. The following sections explain who each product is best for, and why they were selected.
- Southern Ag 006130 Atrazine St. Augustine Weed Killer 32oz Specialty Herbicide
- Spectracide Weed & Feed 20-0-0
- Scotts Turf Builder Southern Lawn Food
- LESCO 50 lb. St. Augustine Grass Weed and Feed with Penoxsulam
- GreenView Broadleaf Weed Control Plus Lawn Food 39 lb
Southern Ag Atrazine St. Augustine Weed Killer
The Southern Ag Atrazine weed killer is designed to target weeds in St. Augustine and centipede grasses. Best for: homeowners who need a targeted herbicide to control broadleaf and grassy weeds in St. Augustine turf. Why selected: It explicitly mentions St. Augustine compatibility and provides a straightforward quart-sized treatment for large areas. Caution: Atrazine use is restricted in some states and may require label follow-through for safe application.
Spectracide Weed & Feed 20-0-0
Spectracide Weed & Feed 20-0-0 combines weed control with lawn feeding. Best for: lawns needing broadleaf weed suppression alongside a nitrogen boost. Why selected: It kills major broadleaf weeds like dandelion, chickweed, clover, and plantain while providing 20% nitrogen for ongoing lawn nourishment. Caution: It is a general weed-and-feed product; verify compatibility with St. Augustine or centipede before application.
Scotts Turf Builder Southern Lawn Food
Scotts Turf Builder Southern Lawn Food is a southern-grass-specific fertilizer designed to support warm-season lawns. Best for: St. Augustine lawns that need steady nitrogen and maintenance during the growing season. Why selected: Formulated for Southern grasses, it helps promote robust green growth with a schedule-friendly application. Caution: This product focuses on fertilization; pair with a weed control product if weed pressure is high.
LESCO 50 lb. St. Augustine Grass Weed and Feed
LESCO 50 lb. St. Augustine Grass Weed and Feed is a professional-grade option tailored for St. Augustine. Best for: larger lawn projects where a dedicated slow-release formula and targeted weed control are needed. Why selected: It combines a 13-0-0 to 17-0-17 blend with a penoxsulam component, designed specifically for St. Augustine turf and Floratam varieties. Caution: Should be applied when turf is wet and requires careful handling to avoid over-application in small lawns.
GreenView Broadleaf Weed Control Plus Lawn Food 39 lb
GreenView Broadleaf Weed Control Plus Lawn Food 39 lb provides comprehensive weed control for up to 15,000 sq. ft. Best for: large lawns needing broadleaf weed suppression while feeding grass. Why selected: GreenSmart Enhanced Efficiency Technology offers extended feeding (up to 8 weeks) and targets 250+ weeds, including dandelion and clover. Caution: For smaller yards, the 39 lb bag may be more than needed and could lead to overspread if not measured carefully.
Buying Guide
Choosing the right product depends on your lawn goals and turf type. Consider these practical factors:
- Grove type compatibility: St. Augustine-specific products are typically labeled for St. Augustine and Floratam varieties. If you have centipede or hybrid grasses, verify label guidance before applying.
- Weed vs. weed-and-feed: If your main issue is weeds, opt for a selective weed killer. If your lawn needs a nutrient boost, a weed-and-feed product can be convenient.
- Application timing: Apply when weeds are actively growing and temperatures suit the product label. Fall applications may differ from spring/summer schedules.
- Area size and coverage: Check coverage on the bag to ensure it matches your lawn square footage. Large bags are cost-effective for big lawns; smaller yards may require precise measurement.
- Safety and local regulations: Some herbicides have state-specific restrictions. Always follow label directions and wear appropriate protection during mixing and application.
- Safety for pets and humans: Many products allow re-entry after drying; others require wait times. Plan applications when the lawn can dry without foot traffic for a specified period.
- Soil and climate considerations: Some fertilizers emphasize slow release and drought resistance, which can be beneficial in hot southern climates.
Frequently Asked Questions
- What is the best product to control weeds in St. Augustine grass?
– A product labeled specifically for St. Augustine or Floratam varieties with targeted weed control is generally best. Consider Southern Ag Atrazine or LESCO Weed and Feed for strong compatibility with St. Augustine lawns. - Can I use weed-and-feed products on St. Augustine grass?
– Yes, but ensure the product is labeled for St. Augustine or Southern grasses and follow label directions to avoid stressing the lawn. - How often should I fertilize a St. Augustine lawn?
– Regular feeding aligned with the growing seasons is common. Use a product designed for Southern grasses and monitor soil moisture to determine timing. - Do I need to water after applying fertilizer or weed killer?
– Many products recommend watering in after application. Follow the specific label for timing and amounts to avoid burn or runoff. - Is overseeding or winterizing necessary for St. Augustine?
– St. Augustine generally does not require overseeding in winter; fall fertilization and weed prevention help prepare for cooler months. Check regional recommendations. - What is the best option for a large area with weed problems?
– A 50 lb bag like LESCO Weed and Feed can cover extensive areas efficiently. For ongoing maintenance, combine with a broadleaf weed-control program as needed.