Maintaining a healthy St Augustine lawn requires the right fertilizer tailored to this warm-season grass. With many options available, choosing a fertilizer that provides balanced nutrients while enhancing color and stress tolerance is essential. Below is a summary table of top fertilizers designed for St Augustine grass, highlighting their key features and coverage.
| Product | Brand | Key Features | Coverage |
|---|---|---|---|
| SeedRanch St. Augustine Lawn 24-2-11 Fertilizer – 50 Lbs. | Lesco | Includes 6% Iron for greening, nutrients tailored for St Augustine | 12,000 sq.ft |
| Sunniland Weed & Feed 20-0-6 Lawn Fertilizer for St. Augustine | Generic | Easy spread granules, controls weeds, two seasonal applications | 5,000 sq.ft |
| Advanced 16-4-8 Balanced NPK Liquid Fertilizer 32 Oz. | Simple Lawn Solutions | Liquid with seaweed & fish, easy spray application, complete NPK blend | Varies (concentrated liquid) |
| Scotts Green Max Lawn Food Plus Iron Supplement | Scotts | Dual-action fertilizer with 5% iron for fast greening | 5,000 sq.ft |
| 10-0-20 Emerald Lawn Fertilizer with Slow-Release Nitrogen – 18 lbs. | Lawn Synergy | Slow-release nitrogen, iron micronutrients, potassium-rich for stress protection | Varies |
SeedRanch St. Augustine Lawn 24-2-11 Fertilizer – 50 Lbs.
This fertilizer is specifically formulated for St Augustine grass with a nutrient profile of 24-2-11, emphasizing high nitrogen content to promote vigorous growth. It contains 6% iron, which helps in deepening lawn greening effectively. Covering up to 12,000 square feet, it provides a broad coverage suitable for medium to large lawns. The formula is designed to supply the essential nutrients for strong root development and sustained turf health throughout the growing season.
Sunniland Weed & Feed 20-0-6 Lawn Fertilizer for St. Augustine
Sunniland offers a convenient weed and feed fertilizer with a 20-0-6 NPK ratio ideal for St Augustine grass. The easy-to-spread granules allow simple application, and it is designed for two seasonal uses in spring and fall. This fertilizer is effective on all types of St Augustine lawns, combining nutrient feeding with weed control to maintain a healthy, weed-free turf. The balanced formula supports steady grass growth while managing unwanted plants.
Advanced 16-4-8 Balanced NPK Liquid Fertilizer – 32 Ounce
This liquid fertilizer from Simple Lawn Solutions offers a balanced 16-4-8 NPK mix enriched with seaweed and fish extracts. Its high-quality feed-grade ingredients facilitate easy nutrient absorption and rapid greening. The ready-to-use spray bottle simplifies application without the mess of granules. Suitable for any grass type including St Augustine, it supports vigorous growth and sustained lawn nourishment with a convenient liquid format.
Scotts Green Max Lawn Food Plus Iron Supplement
Scotts Green Max is a dual-action lawn fertilizer containing 5% iron that promotes rapid greening in just 3 days. Suitable for all grass types, including St Augustine, it can be applied throughout spring, summer, and fall. The combination of fertilizer and iron ensures steady feeding for sustained lushness. This product is formulated to enhance both color and lawn health, making it an efficient choice for quick visual improvements.
10-0-20 Emerald Lawn Fertilizer with Slow-Release Nitrogen – 18 lbs.
This fertilizer provides a potassium-rich 10-0-20 formula ideal for enhancing drought tolerance, disease resistance, and root strength in St Augustine and other warm-season grasses. Featuring 45% slow-release nitrogen with AccuBlu technology, it supplies nutrients steadily for up to eight weeks, minimizing nutrient waste and excessive top growth. The infusion of iron and Nutrace micronutrients delivers a vibrant dark green color without overstimulation.
Buying Guide for St Augustine Lawn Fertilizers
Choosing the best fertilizer for St Augustine grass involves considering several factors to ensure a healthy, verdant lawn:
Nutrient Composition (NPK Ratio)
The balance of nitrogen (N), phosphorus (P), and potassium (K) is crucial. St Augustine lawns benefit from a higher nitrogen ratio to promote green, dense growth, with potassium supporting stress resistance and root development. Phosphorus is typically less emphasized but important during establishment phases.
Iron Content
Iron plays a key role in deep greening without promoting excessive growth. Fertilizers containing iron, such as the 5-6% iron in some products, help enhance the lawn’s vibrant color quickly and sustainably.
Type of Fertilizer
- Granular fertilizers provide longer-lasting feeding, often with slow-release nitrogen options that reduce the need for frequent application and avoid surge growth.
- Liquid fertilizers offer rapid nutrient uptake and are convenient for spot treatments or smaller areas but may require more frequent applications.
- Weed & Feed formulas combine fertilization with weed control, beneficial if controlling weeds is a priority during feeding.
Application Frequency and Coverage
Select fertilizers based on your lawn size and desired maintenance routine. Slow-release formulas allow fewer applications, typically 6-8 weeks apart, while quick-release or liquid fertilizers may require more frequent feeding.
Seasonal Considerations
Apply fertilizers during St Augustine’s active growing season, mainly in late spring through summer. Some products recommend applications in spring and fall for optimal nutrient uptake and lawn preparation against stress.
Environmental Factors
Consider your local climate and potential stressors such as drought or heat. Fertilizers with added potassium and micronutrients enhance stress tolerance, disease resistance, and root strength, essential for Southern warm-season grasses.