Maintaining a healthy and lush St Augustine grass lawn requires the right combination of weed control and fertilization. Selecting the best weed and feed fertilizer tailored for St Augustine grass can help manage unwanted weeds while providing essential nutrients. Below is a summary table featuring highly rated weed and feed fertilizers specifically beneficial for St Augustine lawns, showcasing their key features and suitable applications.
| Product Name | Brand | NPK Ratio | Coverage Area | Special Features |
|---|---|---|---|---|
| Fertilome St. Augustine Weed & Feed 15-0-4 | ferti-lome | 15-0-4 | 12.8 lbs. coverage | Pre/post-emergent weed control, suited for Centipede, Zoysia, St. Augustine |
| Sunniland Weed & Feed 20-0-6 Lawn Fertilizer | Generic | 20-0-6 | 5000 sq. ft. | Easy to spread, recommended for all St. Augustine grass types |
| LESCO St. Augustine Grass Weed and Feed with Penoxsulam | LESCO | 17-0-17 | 50 lbs. / 13,000 sq. ft. | Slow release, safe for Floratam variety, feeds up to 8 weeks |
| Scotts Turf Builder Triple Action1 – Weed Killer | Scotts | N/A (3-in-1 formula) | 4000 sq. ft. (2-Pack) | Kills weeds, prevents crabgrass, feeds lawn |
| SeedRanch St. Augustine Lawn 24-2-11 Fertilizer | Lesco | 24-2-11 | 50 lbs. / 12,000 sq. ft. | Contains 6% Iron for greening, nutrient-rich formula |
Fertilome St. Augustine Weed & Feed 15-0-4 Fertilizer
The Fertilome St. Augustine Weed & Feed product offers a balanced 15-0-4 fertilizer mix combined with a pre-emergent and post-emergent herbicide. It is specifically designed to control weeds efficiently while nourishing lawns. Use on St. Augustine, Centipede, and Zoysia grasses; however, it is not suitable for Bermuda or Northern grass types. This dual-action formula helps prevent new weed seeds from germinating and eliminates existing weeds, providing a healthier turf. The lawn fertilizer helps enhance growth and overall turf vigor with its carefully calculated nutrient ratio.
Sunniland Weed & Feed 20-0-6 Lawn Fertilizer for St. Augustine
Sunniland offers an easy-to-use granule weed and feed fertilizer formulated with a 20-0-6 nutrient balance. It works well for all varieties of St. Augustine grass and provides an ideal nutrient boost while tackling common weeds. The granules are straightforward to spread, supporting two recommended applications each year—in spring and fall. This product aids both weed suppression and healthy grass growth through targeted fertilization, fitting homeowners seeking reliable lawn care with minimal fuss.
LESCO 50 lb. St. Augustine Grass Weed and Feed with Penoxsulam
This professional-grade LESCO weed and feed fertilizer features a 17-0-17 NPK ratio with 30% poly coated sulfur coated urea, ensuring slow and steady nutrient release lasting up to 8 weeks. It’s specially formulated to support St. Augustine grass including the Floratam variety, which is known for its sensitivity to some chemicals. Application requires wet turf, with drying time post-application allowing for optimal weed control and nutrient absorption. Its balanced formula promotes dense, green turf that resists weed infestation effectively.
Scotts Turf Builder Triple Action1 – Weed Killer and Lawn Fertilizer
The Scotts Turf Builder Triple Action1 combines weed killing, crabgrass prevention, and lawn feeding in one product. It controls troublesome broadleaf weeds like dandelion, clover, dollarweed, and henbit while preventing crabgrass for up to four months. Regular application feeds grass to build lawn density and boost healthy growth. Although not a traditional weed and feed ratio fertilizer, its multi-purpose formula works well for improving overall lawn quality on St. Augustine grass.
SeedRanch St. Augustine Lawn Fertilizer 24-2-11 with Iron
This SeedRanch fertilizer is formulated with a rich 24-2-11 nutrient ratio plus 6% iron, which promotes a deep green color and robust growth of St. Augustine grass. Covering up to 12,000 square feet, it provides essential nutrients designed to improve turf health and resistance against weed encroachment indirectly through improved lawn thickness. The inclusion of iron adds to the greening effect, making it an excellent choice for lawns needing both nourishment and aesthetic improvement.
Buying Guide For Weed And Feed Fertilizers For St Augustine Grass
Choosing the best weed and feed fertilizer for your St Augustine lawn depends on several important factors:
1. Nutrient Ratio (NPK)
The balance of nitrogen (N), phosphorus (P), and potassium (K) plays a critical role. St Augustine grass benefits from a higher nitrogen ratio for healthy green growth (often more than 15% nitrogen). Potassium supports root development and stress resistance, while phosphorus helps root establishment. Select a formula tailored for warm-season grasses with an NPK ratio supporting vigorous growth.
2. Weed Control Spectrum
Check whether the product controls the common broadleaf weeds and grassy weeds found in your region, such as crabgrass, dandelions, clover, chickweed, and dollarweed. Some formulas are dual-action, containing pre-emergent and post-emergent herbicides to prevent and eliminate weeds effectively.
3. Turf Compatibility
Not all weed and feed fertilizers are suitable for every grass type. Look for fertilizers specifically labeled for St Augustine grass, ensuring no damage to your lawn. Products safe for Floratam varieties or other regional subtypes are preferable.
4. Application Timing And Frequency
Follow guidelines for the best timing of application, typically two times yearly — early spring and fall. Some products offer slow-release nutrients providing feeding for weeks, reducing the frequency needed.
5. Ease Of Use
Choose between granular or liquid formulations depending on your preference and equipment available. Granules are easy to spread with common spreaders, while liquid fertilizers often combine feeding with watering for convenience.
6. Environmental Considerations
Opt for products with responsible chemical formulations that minimize environmental impact, especially near water sources. Follow all label instructions carefully to avoid runoff issues.
Proper selection and application of a weed and feed fertilizer can significantly improve your St Augustine lawn’s appearance and health by efficiently managing weeds and providing balanced nutrients.