St. Augustine grass thrives with a balanced 16-4-8 fertilizer that provides ample nitrogen for green growth, phosphorus for strong roots, and potassium for stress tolerance. This guide highlights five highly compatible options and explains how to apply them effectively for St. Augustine turf in American lawns. Each product section includes key features, application notes, and coverage considerations to help you choose the right fertilizer plan for your yard.
| Product | Brand | Form | Typical Coverage |
|---|---|---|---|
| Advanced 16-4-8 Lawn Fertilizer (Liquid) | Simple Lawn Solutions | Liquid (1 quart) | Variable by sprayer size |
| Advanced 16-4-8 Lawn Fertilizer (Liquid) | Simple Lawn Solutions | Liquid (1 gallon) | Up to 12,800 sq ft per gallon |
| Advanced 16-4-8 Lawn Fertilizer (Liquid, 2.5 gallons) | Simple Lawn Solutions | Liquid | Up to 32,000 sq ft |
| Advanced 16-4-8 Lawn Fertilizer (Liquid, 64 oz) | Simple Lawn Solutions | Liquid (64 oz) | Concentrated coverage by sprayer |
| The Andersons PGF 16-4-8 | The Andersons | Granular | 40 lb bag covers large areas |
Note: The table above reflects a mix of liquid and granular 16-4-8 options that work well with St. Augustine grass. Always follow label directions for your specific product and local lawn care guidelines.
Advanced 16-4-8 Liquid Lawn Fertilizer (1 Quart)
This liquid lawn food delivers a balanced 16-4-8 NPK blend with Seaweed & Fish additives to support green color, growth, and root vigor. The formula is designed for versatility across grass types, including St. Augustine, and is intended for use with common sprayers—hose-end, backpack, pump-up, or watering can. The nitrogen component supports chlorophyll production for a vibrant lawn while phosphorus and potassium support overall plant health. It is suitable for regular or seasonal feeding programs as part of a lawn care routine.
Advanced 16-4-8 Liquid Lawn Fertilizer (1 Gallon)
Ideal for larger properties, this 1-gallon concentrate provides coverage for up to 12,800 square feet per bottle. It emphasizes a complete NPK (16-4-8) mix with Seaweed & Fish, designed to promote lush greening and robust root growth. The product is positioned for monthly use that’s compatible with a standard lawn care routine, helping to maintain a steady supply of nutrients over time. It is especially useful for homeowners who want consistent, scalable application across bigger lawns.
Advanced 16-4-8 Lawn Fertilizer (Liquid, 2.5 Gallons)
With 2.5 gallons, this option delivers up to 32,000 square feet of coverage for large landscapes or professional lawn services. The 16-4-8 ratio is paired with Seaweed & Fish to support greening, growth, and nutrient uptake. The product is designed for use with hose-end sprayers, pump sprayers, or other compatible equipment, and it enables volume-based application schedules that align with seasonal lawn care plans. It is a practical choice for property owners seeking an economical long-term feeding program.
Advanced 16-4-8 Lawn Fertilizer (Liquid, 64 Ounce)
This smaller, concentrated bottle covers specific smaller lawns or targeted applications, delivering a balanced 16-4-8 mix with Seaweed & Fish. The 64-ounce size makes it suitable for homeowners who prefer precise dosing with standard spray equipment. It supports lawn greening and growth while providing essential nutrients to boost root strength and overall turf vitality when used according to label directions.
The Andersons PGF Complete 16-4-8 Fertilizer with Humic
This professional-grade granular fertilizer uses a 16-4-8 ratio complemented by Humic DG for total nutrition. The product includes iron and micronutrients to support dense, green turf and a robust root system. Quick- and slow-release nitrogen options help provide both immediate feeding and extended feeding over several weeks. It is suitable for St. Augustine lawns and other warm-season grasses, offering sustained color and growth with a formulation designed for even distribution by standard spreaders.
The Andersons PGF 16-0-8 Fertilizer With Humic DG
This product features a phosphorus-free 16-0-8 blend with Humic DG, designed for situations where phosphorus must be limited. It provides quick- and slow-release nitrogen for extended feeding, making it suitable for St. Augustine turf where nutrient timing matters. The reduced phosphorus option helps manage environmental concerns while still delivering essential nitrogen for green growth and sustained lawn health.
LESCO 50 lb St. Augustine Weed and Feed
Specifically designed for St. Augustine turf, this weed-and-feed product combines a 17-0-17 fertilizer with targeted herbicides to control broadleaf and grassy weeds. The product is intended for application when turf is wet and then allowed to dry for results within a couple of weeks. It is formulated to be safe on Floratam varieties while providing up to eight weeks of feeding, with slow-release components to support ongoing lawn health and weed suppression.
Buying Guide: Key Considerations For 16-4-8 Fertilizers For St. Augustine
When selecting a 16-4-8 fertilizer for St. Augustine grass, consider:
- Form: Choose liquid fertilizers for quick greening and easier uniform coverage, or granular for longer-lasting feeding and simple dosing with spreaders.
- Application method: Hose-end, pump sprayers, or using spreaders with granular formulations—ensure compatibility with your equipment and lawn size.
- Soil and climate: In warmer regions, St. Augustine can tolerate higher nitrogen; monitor soil texture, pH, and moisture to optimize uptake and minimize burn risk.
- Activators and additives: Seaweed, fish emulsions, and humic substances can enhance nutrient availability and root development, especially in stressed lawns.
- Weed control: For weed management in St. Augustine, consider weed-and-feed products with herbicides suitable for your lawn type, and avoid phosphorus-heavy blends if soil testing indicates excessive phosphorus.
- Feeding schedule: Align fertilizer applications with the growing season and rainfall. Avoid overfertilization, which can lead to thatch buildup or nutrient runoff.
- Environmental impact: Choose formulations with slow-release nitrogen to minimize leaching and protect nearby waterways.
In summary, the right 16-4-8 fertilizer for St. Augustine grass provides a balanced nutrient profile, compatibility with your lawn care routine, and considerations for weed pressure and environmental stewardship. The products listed here cover a range of formats and application scales to fit typical American lawns.