Best Liquid Weed and Feed Solutions for St Augustine Grass 2025
Maintaining a healthy St Augustine grass lawn requires effective weed control combined with proper fertilization. Choosing the right liquid weed and feed product can help you manage common broadleaf weeds while enhancing the growth and appearance of your lawn. Below is a summary of the top-rated liquid weed and feed options designed specifically for St Augustine grass, perfect for American lawns.
| Product | Brand | Fertilizer NPK | Weed Control | Application |
|---|---|---|---|---|
| Scotts Liquid Turf Builder with Plus 2 Weed Control | Scotts | Contains nitrogen boost | Broadleaf weeds including dandelion, clover, poison ivy | Ready-to-spray liquid |
| Southern Ag Atrazine St. Augustine Weed Killer | Southern Ag | Herbicide, no fertilizer NPK data | Targets St. Augustine and Centipede grasses weeds | Liquid herbicide spray |
| Fertilome St. Augustine Weed & Feed 15-0-4 | Ferti-lome | 15-0-4 (N-P-K) | Pre and post-emergent broadleaf weed control | Granular, pre-mixed fertilizer and herbicide |
| Simple Lawn Solutions Balanced 16-4-8 Liquid Fertilizer | Simple Lawn Solutions | 16-4-8 (N-P-K) plus Seaweed & Fish | Fertilizer only, no weed control | Liquid spray fertilizer |
| Spectracide Weed & Feed 20-0-0 | Spectracide | 20-0-0 (Nitrogen) | Broadleaf weed control | Ready-to-spray liquid |
Scotts Liquid Turf Builder With Plus 2 Weed Control
Scotts Liquid Turf Builder with Plus 2 Weed Control combines a nitrogen-rich lawn fertilizer with a target-specific weed killer in a ready-to-spray liquid formula. This product controls dandelion, clover, ground ivy, henbit, chickweed, plantain, poison ivy, and other listed broadleaf weeds while providing your St Augustine grass a quick boost of nitrogen for enhanced greening and growth. It is best to apply when weeds are actively growing for optimal efficacy. The product is user-friendly and helps maintain a healthy, weed-free lawn with a single application.
Southern Ag Atrazine St Augustine Weed Killer
Southern Ag Atrazine is a specialty herbicide designed specifically to control weeds in St. Augustine and Centipede grasses. A single 32 oz bottle treats up to 3,720 square feet. This liquid weed killer is suited for eliminating broadleaf weeds without harming St Augustine grass varieties. Because it is a herbicide only, it does not provide fertilizer nutrients, so separate fertilization may be necessary. It is popular for targeted weed control, especially on stubborn or persistent weeds that invade Southern lawns.
Fertilome St Augustine Weed & Feed 15-0-4
Fertilome 15-0-4 Weed & Feed combines a pre-emergent and post-emergent herbicide with a fertilizer specially formulated for St Augustine, Centipede, and Zoysia grasses. The fertilizer mix (15-0-4 NPK) supplies nitrogen and potassium to strengthen grass while suppressing weed growth. It is important to avoid use on Bermuda grass or Northern grasses. This granular product provides effective long-term weed control and nutrient support, helping maintain a thick, healthy lawn free from invasive weeds.
Simple Lawn Solutions Advanced 16-4-8 Liquid Fertilizer
The Simple Lawn Solutions Advanced 16-4-8 is a liquid lawn food focused on fertilization with a balanced nutrient formula of nitrogen, phosphorus, and potassium plus natural seaweed and fish extracts. While this product does not include weed control, it provides comprehensive nutrition to support strong root development and lush foliage for all grass types, including St Augustine. Its ready-to-use spray format is convenient for quick and even lawn feeding.
Spectracide Weed & Feed 20-0-0 Ready-To-Spray
Spectracide Weed & Feed 20-0-0 offers a dual-action liquid formula that kills major broadleaf weeds such as dandelion, chickweed, clover, and more while feeding your lawn with 20% nitrogen fertilizer. It is a ready-to-spray concentrate ideal for quick application. Perfect for St Augustine lawns requiring weed suppression alongside nitrogen feeding, this product helps green your grass and control troublesome broadleaf weeds effectively.
Buying Guide For Liquid Weed And Feed For St Augustine Grass
When choosing the best liquid weed and feed for St Augustine grass lawns, consider the following key factors:
- Weed Control Spectrum: Identify which weeds are most common in your lawn (broadleaf, grassy weeds, or specific types) and select a product that targets those species effectively.
- Fertilizer Nutrient Ratio: St Augustine grass typically benefits from a fertilizer rich in nitrogen to promote lush green growth. Check the N-P-K ratio to ensure it meets your lawn’s needs, often with higher nitrogen content.
- Application Convenience: Liquid ready-to-spray products provide easy and quick application compared to granules. Consider the size of your lawn and how simple you want the process to be.
- Grass Type Compatibility: Some weed and feed formulations are specific to Southern grasses (like St Augustine) and may damage others, so verify the product is safe for your grass variety.
- Timing And Frequency: Determine whether the product is suitable for pre-emergent (prevent weed germination) or post-emergent (kills existing weeds) use, and how often it can be applied in a growing season.
- Safety Precautions: Follow instructions carefully—some herbicides require the lawn to be wet or dry for application and special care around pets and children.
- Additional Nutrients: Ingredients like seaweed extract or slow-release nitrogen can provide extended feeding benefits, promoting sustained lawn health.
By assessing these considerations thoroughly, homeowners can select a liquid weed and feed product that optimally balances effective weed control with nutrient delivery to maintain a vibrant and healthy St Augustine grass lawn year-round.