Quality fertilizer is essential for St. Augustine grass to maintain a deep green color, strong roots, and healthy growth. This guide highlights five popular options designed to support St. Augustine varieties, including weed control blends and slow-release formulas. Each product is evaluated for coverage, nutrients, and suitability for common St. Augustine cultivars. Whether you want a balanced NPK mix or a specialized weed-and-feed formula, these picks aim to help you achieve a vibrant, resilient lawn.
| Product | NPK / Type | Coverage | Notes |
|---|---|---|---|
| Sunniland Weed & Feed 20-0-6 | 20-0-6; Weed & Feed | 5000 sq. ft. | Spring & fall applications; good for St. Augustine lawns |
| SeedRanch St. Augustine Lawn 24-2-11 | 24-2-11; Fertilizer with Iron | 12,000 sq.ft. | Iron for greening; nutrient-rich for St. Augustine |
| LESCO 50 lb St. Augustine Weed & Feed | 17-0-17; includes Penoxsulam | 13,000 sq.ft. | Specially formulated for St. Augustine; slow release |
| Emerald 10-0-20 Lawn Fertilizer | 10-0-20; NPK with micronutrients | Varies by bag size | Deep green color; Nutrace micronutrients |
| Organic Plant Magic Slow Release Granular Lawn Fertilizer | Organic; slow release | 20 lb bag | Truly organic, safe for kids and pets; GroBiotics |
Sunniland Weed & Feed 20-0-6 Lawn Fertilizer Review
Sunniland Weed & Feed 20-0-6 is a convenient option for St. Augustine lawns seeking a weed-control benefit alongside fertilizer. The product features easy-to-spread granules and is designed for two applications annually—one in spring and another in fall—helping to maintain lawn health and reduce weed pressure. This formulation is suitable for all types of St. Augustine grass, making it a versatile choice for homeowners who want a simple seasonal schedule without separate weed management products.
SeedRanch St. Augustine Lawn 24-2-11 Fertilizer
SeedRanch St. Augustine Lawn 24-2-11 provides a balanced nutrient profile with 6% iron for strong greening. Designed for St. Augustine lawns, this 50-pound bag covers up to 12,000 sq. ft. and targets turf health by delivering essential nutrients while supporting a robust root system. The iron content can enhance color, although it may require steady, consistent application to sustain a deep green hue through seasonal changes.
LESCO 50 lb St. Augustine Weed & Feed
LESCO 50 lb St. Augustine Weed & Feed stands out with a 17-0-17 formulation and 30% coated sulfur urea for slow release. It is specifically noted for St. Augustine turf, with coverage around 13,000 sq ft. The product is designed to be applied when the turf is wet, then allowed to dry, delivering visible results within about two weeks. It is considered safe for Floratam varieties and provides extended feeding up to eight weeks, combining weed control with nutrition in a single application.
Emerald 10-0-20 Lawn Fertilizer
Emerald 10-0-20 Lawn Fertilizer offers a balanced NPK with micronutrients and AccuBlu technology for a steady, eight-week feeding window. The product emphasizes a deep green color while avoiding excessive growth, supported by iron and NuTrace micronutrients. This makes it a strong option for St. Augustine lawns seeking color enhancement without rapid top growth, particularly in warm-season climates where drought resilience and root health are important.
Organic Plant Magic Slow Release Granular Lawn Fertilizer
Organic Plant Magic offers a truly organic slow-release option designed for all lawn types, including St. Augustine. It features GroBiotics with amino and humic acids and is marketed as safe for kids, pets, and the environment. The product emphasizes all-purpose use—from maintenance to recovery—and is suitable for diverse regions and seasons, supporting steady growth with a natural approach.
Buying Guide
Key purchase considerations for St. Augustine grass fertilizers include formulation type, iron content, and whether a weed-control blend is needed. Dry granular formulas are common, offering easy spreading and longer intervals between applications, while liquid or specialty blends provide rapid nutrient delivery or targeted weed control. For color and greening, irons and micronutrients can be beneficial, but consistent scheduling is essential to maintain a balanced lawn.
- Coverage and seasonal plan: Choose a product that fits your lawn size and preferred application schedule (spring and fall versus year-round).
- NPK balance: St. Augustine often benefits from balanced or slightly high nitrogen (N) with phosphorus (P) and potassium (K) to promote root health and tolerance to heat and drought.
- Weed control: Weed-and-feed formulations help reduce broadleaf weeds, but may require careful timing to avoid stressing the grass during heat waves.
- Iron and greening: Iron-rich blends can enhance color, but excessive iron can cause discoloration if misapplied.
- Slow-release versus quick-release: Slow-release fertilizers provide steady nutrition and less waste, while quick-release products can address rapid browning or nutrient deficiencies quickly.
- Organic options: Organic fertilizers support long-term soil health and are safer for households with kids and pets, though they may act more slowly.
- Compatibility with turf type: Confirm compatibility with your specific St. Augustine cultivar (e.g., Floratam) to ensure safety and effectiveness.
In practice, a homeowner might alternate a weed-and-feed product with a balanced granular option, adjusting timing to local climate and lawn condition. Always follow label directions, apply with proper equipment, and water after application if required. For best results, test your soil periodically to tailor nutrient choices to your lawn’s needs.