Choosing the right fertilizer for St Augustine grass is essential for maintaining a lush, healthy lawn. Organic fertilizers offer natural nutrients that improve soil health while supporting grass growth without harsh chemicals. Below is a summary table highlighting the top recommended organic fertilizers designed specifically for St Augustine grass, combining effectiveness, safety, and ease of use.
| Product Name | Brand | Key Features |
|---|---|---|
| Organic Plant Magic – Truly Organic™ Slow Release Granular Lawn Fertilizer | Organic Plant Magic | Amino & Humic Acids, Beneficial Biology, Safe for Kids & Pets |
| Fertilome St. Augustine Weed & Feed 15-0-4 | ferti-lome | Pre & post-emergent weed control, fertilizer mix for St Augustine |
| Espoma Organic All Season Lawn Food 9-0-0 | Espoma | Natural & organic nitrogen, enhances deep green color, safe for all lawns |
| LESCO 50 lb. St. Augustine Grass Weed and Feed | LESCO | Slow-release formula, weed control, safe for Floratam variety |
| Sunniland Weed & Feed 20-0-6 Lawn Fertilizer | Generic | Easy to spread granules, effective spring & fall application for St Augustine |
Organic Plant Magic Slow Release Fertilizer for St Augustine
Organic Plant Magic offers a truly organic slow-release granular fertilizer ideal for St Augustine grass. It is alive with GroBiotics—a unique blend of amino and humic acids combined with beneficial microbiology—to naturally enhance soil and turf health. This fertilizer provides complete nutrition through natural processes, promoting vigorous grass growth.
It is safe for kids, pets, and the environment, made with non-toxic ingredients and free from harmful chemicals. Suitable for various lawn maintenance tasks like repair, recovery, and sod installation, it works effectively in all regions, seasons, and grass types. The granular format ensures even distribution and long-lasting results, making it a reliable choice for organic lawn care.
Fertilome St Augustine Weed & Feed 15-0-4 Fertilizer
This product by Fertilome is a combination of pre-emergent and post-emergent herbicide with a fertilizer mix tailored for St Augustine, Centipede, and Zoysia grasses. The fertilizer concentration is 15-0-4, supporting healthy growth while controlling unwanted weeds.
It is important to note this formula is specifically designed for warm-season grasses like St Augustine, but it should not be used on Bermuda grasses or cool-season northern grasses. This selective herbicide and fertilizer combination provides an effective way to maintain weed control and feed your lawn simultaneously.
Espoma Organic All Season Natural Lawn Food
The Espoma Organic All Season lawn fertilizer features a 9-0-0 nutrient profile, emphasizing a long-lasting organic nitrogen source ideal for lush lawn color and growth. Its special Bio-tone formula enhances soil biology for improved nutrient absorption.
This formula is safe for St Augustine grass and other common lawn grasses, including cool and warm season types. It will not burn your lawn or leach nutrients prematurely, making it suitable for routine applications in the spring and fall seasons.
LESCO 50 lb. St. Augustine Grass Weed and Feed Fertilizer
LESCO contains a 17-0-17 formula with 30% poly-coated and sulfur-coated urea for slow-release nitrogen feeding that lasts up to 8 weeks. This product is formulated specifically for St Augustine grass, including the Floratam variety, helping lawnkeepers maintain thick, vibrant turf.
For best results, apply LESCO weed and feed when the turf is wet and allow it to dry afterward. The combination of fertilizer and weed control helps transform weeds while nourishing your St Augustine lawn, improving overall lawn health and appearance.
Sunniland Weed & Feed Fertilizer for St Augustine Lawns
This Sunniland fertilizer is easy to apply with granules designed for quick, uniform spreading over your St Augustine lawn. It is recommended for two applications per year—typically in spring and fall—to maintain weed control and encourage grass growth.
Formulated specifically for all types of St Augustine grass, Sunniland balances weed treatment with essential nutrients (20-0-6), offering a practical solution to promote lawn vigor while managing problematic weeds efficiently.
Buying Guide for Organic Fertilizers for St Augustine Grass
1. Nutrient Composition
St Augustine grass requires adequate nitrogen to maintain its rich green color and density, but phosphorus and potassium levels also support root and disease resistance. Look for balanced formulas matching your lawn’s soil test results to avoid deficiencies or excessive fertilization.
2. Organic Certification and Ingredients
Choose fertilizers labeled as 100% organic or natural, containing no synthetic chemicals or harmful additives. Ingredients like humic acids, beneficial microbes, and natural nitrogen sources help improve soil health and sustainability.
3. Slow-Release vs. Fast-Release Fertilizers
Slow-release components provide consistent feeding over several weeks, reducing nutrient leaching and minimizing burn risk. Fast-release fertilizers act quickly but require more frequent applications. For organic lawn care, slow-release organic nutrients are typically preferred.
4. Weed and Pest Control Integration
Some fertilizers combine weed control with nutritional benefits, which can simplify lawn care. Ensure the herbicides in these blends are effective yet safe for St Augustine grass and your geographical region.
5. Application Timing and Frequency
Most organic fertilizers work well when applied in spring and fall. Check product recommendations for how often to apply and whether additional watering is required. Proper timing enhances nutrient absorption and lawn recovery.
6. Safety Considerations
Products that are safe for children, pets, and the environment are preferable. Avoid fertilizers with toxic ingredients or harsh chemicals, especially in homes with outdoor activity areas.
7. Area Coverage and Quantity
Verify how much area a bag covers (typically measured in square feet) and select quantities based on your lawn size to ensure adequate nourishment without waste.
8. Compatibility with Local Climate and Grass Variety
Ensure the fertilizer suits your region’s climate and is formulated for St Augustine grass specifically, as nutrient needs and weed pressure can vary widely.