Best Fertilizers for St Augustine Sod to Achieve Lush Green Lawns 2025
Proper fertilization is key to maintaining a healthy and vibrant St Augustine sod lawn. Choosing the right fertilizer delivers essential nutrients that promote deep greening, vigorous growth, and weed control suitable for this grass type. Below is a summary table of top-rated fertilizers designed specifically to enhance St Augustine sod.
| Product | Brand | Key Features |
|---|---|---|
| Scotts Green Max Lawn Food | Scotts | Feeds lawn with iron for greening in 3 days; suitable spring-fall application |
| Advanced 16-4-8 Balanced NPK Liquid Fertilizer | Simple Lawn Solutions | Complete NPK with seaweed & fish; easy spray application |
| Fertilome St. Augustine Weed & Feed 15-0-4 | ferti-lome | Pre- and post-emergent weed control plus fertilizer |
| Pennington Full Season Lawn Fertilizer 32-0-5 | Pennington | One application per season; natural microorganisms; 5% iron for greening |
| LESCO St. Augustine Grass Weed and Feed 17-0-17 | LESCO | Slow-release formula; sulfur-coated urea; safe for Floratam variety |
Scotts Green Max Lawn Food – Fertilizer Plus Iron Supplement
Scotts Green Max Lawn Food combines a potent dual-action fertilizer with 5% iron, essential for rapid greening of St Augustine sod. Its formula promises visible results within three days by feeding the lawn deeply and intensifying its green color. Suitable for application in spring, summer, and fall, this fertilizer provides versatility across growing seasons for different grass types, including St Augustine. The iron content supports chlorophyll production, which is crucial for lush green turf. This product covers up to 5,000 square feet, ideal for mid-sized lawns seeking a fast-acting solution.
Advanced 16-4-8 Balanced NPK Liquid Fertilizer by Simple Lawn Solutions
This 16-4-8 liquid fertilizer by Simple Lawn Solutions offers a balanced blend of nitrogen, phosphorus, and potassium. Enhanced with natural seaweed and fish extracts, it nourishes St Augustine grass with high-quality feed-grade ingredients. Its liquid form makes application straightforward with the included sprayer, allowing an even distribution of nutrients that promote greening and sustained growth through spring and summer. This formula supports overall lawn vigor and helps lawns tolerate environmental stresses while being suitable for any grass type, including St Augustine.
Fertilome St. Augustine Weed & Feed 15-0-4
The Fertilome St. Augustine Weed & Feed combines a 15-0-4 fertilizer blend with a pre-emergent and post-emergent herbicide to control weeds effectively while feeding your lawn. Specially formulated for Centipede, Zoysia, and St. Augustine grasses, this product helps maintain turf health while suppressing unwanted weeds. It is specifically not recommended for Bermuda or Northern grass types. This fertilizer is ideal for homeowners seeking an integrated weed and feed solution that enhances OD green turf health and manages common turf weeds in warm-season grasses.
Pennington Full Season Lawn Fertilizer 32-0-5 with Iron
Pennington Full Season Lawn Fertilizer provides a comprehensive feeding for St Augustine sod with a 32-0-5 nutrient ratio and 5% iron content for deep, lasting greening. This one-application fertilizer lasts through an entire season, reducing the need for frequent treatments. The formula also includes natural beneficial microorganisms that help revitalize soil and promote root health. It suits homeowners seeking season-long lawn rejuvenation combined with slow-release feeding for steady nutrient availability and stronger turf resilience.
LESCO St. Augustine Grass Weed and Feed 17-0-17 with Penoxsulam
The LESCO Weed and Feed for St Augustine grass offers a balanced 17-0-17 fertilizer with penoxsulam herbicide to control a wide variety of weeds. The product features 30% poly-coated sulfur-coated urea for slow-release nitrogen feeding, providing nutrients for up to eight weeks. It is safe for Floratam variety St Augustine and is best applied on wet turf, allowing the formula to dry for effective results in about two weeks. This fertilizer supports sustained growth and weed management in professional turf care.
Buying Guide: Key Factors When Choosing Fertilizer for St Augustine Sod
Choosing the best fertilizer for St Augustine sod involves considering several critical aspects to optimize lawn health and appearance.
Nutrient Composition (NPK Ratio)
St Augustine grass thrives with a moderate-to-high nitrogen ratio for lush green growth. A balanced blend with potassium supports root and turf hardiness, while phosphorus is usually required in minimal amounts unless soil tests indicate a deficiency. Common effective ratios range around 15-0-15, 16-4-8, or 32-0-5 depending on specific lawn needs and soil fertility.
Iron Content
Iron enhances the deep green color of St Augustine lawns without promoting excessive blade growth. Fertilizers with 3-6% iron content, like some in the list, deliver faster greening and improved chlorophyll production.
Slow-Release vs. Quick-Release
Slow-release formulas provide nutrients steadily over several weeks, reducing the frequency of applications and minimizing fertilizer burn risks. Quick-release fertilizers act rapidly but may require repeat applications. For St Augustine grass, slow-release is usually preferable for sustained health.
Weed Control Integration
Combining fertilizer with pre- or post-emergent herbicides can save time and protect the lawn from common St Augustine weeds. Products like Fertilome and LESCO offer weed and feed combinations tailored to this grass type.
Application Method and Seasonality
Liquid fertilizers provide fast nutrient uptake and ease of application but may need frequent treatments. Granular fertilizers can provide longer feeding intervals. Timing is essential; fertilizing St Augustine sod during active growing seasons—spring through early fall—ensures optimal nutrient utilization.
Grass Variety Compatibility
Always verify the fertilizer is intended for St Augustine grass to avoid damage to other turf types. Some fertilizers are specifically formulated for Floratam or other St Augustine varieties, important for safe and effective results.
Soil and Environmental Considerations
Test soil nutrient levels and pH prior to fertilization to guide product choice. Consider environmental factors such as rainfall, temperature, and local regulations on fertilizer use.