Finding the right liquid weed and feed or granular fertilizer for St. Augustine grass can be challenging, especially in southern lawns where heat and humidity favor the growth of weeds like crabgrass and clover. This guide highlights five top options designed to protect and feed St. Augustine lawns while controlling broadleaf and grassy weeds. Each product section includes practical usage notes and key features to help you compare quickly.
| Product | Brand |
|---|---|
| BioAdvanced 3-in-1 Weed and Feed | BioAdvanced |
| Sunniland St. Augustine Weed & Feed | Generic |
| Scotts Liquid Turf Builder with Plus 2 Weed Control | Scotts |
| Spectracide Weed Stop For Lawns | Spectracide |
| Southern Ag Atrazine St. Augustine Grass Weed Killer | Southern Ag |
The following sections cover five selected products that best align with St. Augustine grass weed and feed needs, focusing on effective weed control, compatibility with Floratam and other St. Augustine varieties, and safe, consistent feeding to promote a healthy lawn.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns
BioAdvanced 3-in-1 Weed and Feed is designed specifically for southern lawns, including St. Augustinegrass and Floratam varieties. It combines weed control with lawn fertilization and long-lasting protection. The formulation targets common broadleaf weeds such as dandelion, dollarweed, and clover, while delivering a weed-prevention effect for up to six months. For St. Augustine lawns, the product supports healthy growth and helps maintain visual appeal by suppressing listed weeds that compete for nutrients and water. Application timing and rate should follow label directions to ensure coverage and minimize stress in hot months.
Sunniland St.Augustine Weed & Feed Lawn Fertilizer
Sunniland’s St. Augustine Weed & Feed is designed for St. Augustine grasses and covers up to 5,000 square feet. The product is spreadable granules suitable for homeowners seeking a straightforward feeding and weed-control solution. It is marketed with two annual applications—spring and fall—making it convenient for seasonal lawn care. Easy handling and even spreading are emphasized to minimize gaps in coverage. While not a liquid, its compatibility with St. Augustine varieties makes it a practical choice for homeowners who prefer granular formulas for weed control and nutrient delivery.
Southern Ag Atrazine St. Augustine Grass Weed Killer
Southern Ag Atrazine St. Augustine Grass Weed Killer concentrates on broadleaf weed control, including weeds that commonly invade St. Augustine lawns. This product can provide suppression of crabgrass and related grasses when used as part of an integrated lawn care plan. It is suitable for larger applications and offers flexibility for controlling a wide range of annual weeds. As with any herbicide, follow label directions for timing, application rates, and compatibility with Floratam and other St. Augustine varieties to minimize potential turf stress during hot months.
Spectracide Weed Stop For Lawns (St. Augustine & Centipede)
Spectracide Weed Stop For Lawns is a ready-to-spray option formulated to kill broadleaf weeds while feeding the lawn. It includes atrazine in the mix, which is effective for lawn weed control in St. Augustine varieties and centipedegrass. The ready-to-spray format provides quick, direct application and can help address actively growing weeds with a fast-action approach. As with all herbicides, proper timing and targeted spraying are important to minimize damage to desirable turf. The dual-action approach supports both immediate weed removal and ongoing lawn feeding.
The Andersons Premium Weed And Feed
The Andersons Premium Weed and Feed blends quick- and slow-release nitrogen to deliver a fast green-up alongside extended feeding. While designed for broader lawn types, it is frequently used on St. Augustine lawns seeking robust weed control and robust nutrient delivery. The product targets existing dandelions and more than 250 broadleaf weeds through its formulation. Homeowners should follow the label for application rates and timing to optimize turf recovery and minimize stress during hot seasons.
Buying Guide: Key Purchase Considerations
- Grass compatibility: Ensure the product is labeled for St. Augustine or Floratam varieties to avoid turf damage.
- Weed control spectrum: Look for formulations that address both broadleaf and grassy weeds common in southern lawns, such as crabgrass, dandelion, dollarweed, and clover.
- Form factor: Liquid weed killers with fertilizer offer immediate weed control and rapid green-up, while granules provide easier spread and long-lasting feeding. Choose based on your preferred application method and lawn size.
- Slow-release vs. quick-release nitrogen: Slow-release formulations extend feeding and reduce burn risk, especially in heat. Quick-release nitrogen provides faster greening but can stress stressed turf if misapplied.
- Seasonal timing: Spring and fall applications are common for St. Augustine lawns, but some products offer extended protection for up to six months. Align with local climate and pre-emergence needs for crabgrass.
- Application safety: Always follow label directions, wear protective gear, and water after application if required by the product. Avoid applying during extreme heat or drought conditions to minimize turf stress.
- Environmental impact: Consider selective herbicides that minimize harm to beneficial organisms and avoid overuse that can lead to weed resistance over time.
- Cost and coverage: Compare coverage per bag or bottle and per-square-foot cost to determine the best value for your lawn size, while keeping in mind the pest pressure in your area.
Choosing the right liquid or granular weed-and-feed product for St. Augustine grass depends on your lawn’s weed pressure, preferred application method, and climate. The products listed above are commonly used by homeowners and professionals to maintain healthy, green St. Augustine lawns while controlling the most frequent weeds found in southern regions.