Your lawn feels like a brittle, yellowed doormat under your feet. Instead of a thick, verdant carpet, you see thin patches and aggressive weeds fighting for space. St. Augustine grass is finicky, demanding a specific diet to stay deep green and resilient.
Choosing the right nutrients changes the entire character of your yard. We narrowed the field to the Best St Augustine Grass Fertilizers to help you restore your turf. Read on to see which formula matches your soil conditions.
Key Takeaways
- Prioritize formulas with slow-release nitrogen to provide consistent growth without causing quick, unsustainable surges.
- Check the label for atrazine or penoxsulam if you need to tackle weeds while simultaneously feeding the grass.
- Select iron-rich blends if your main goal is achieving a deep, dark green color rather than rapid top growth.
- Match your product to your equipment, choosing granular options for broadcast spreaders or liquid concentrates for spot treatments.
- Verify the phosphorus content based on your local regulations, as many regions restrict this nutrient to protect waterways.
| Best Heavy Duty Control |  |
LESCO St. Augustine Weed and Feed | Eliminates broadleaf weeds effectively | Professional grade formulation | Supports dense growth | View on Amazon | Read Review |
| Rapid Growth Booster |  |
St. Augustine Liquid Lawn Food | Absorbs directly into leaves | Encourages rapid runner growth | Ideal for touch-ups | View on Amazon | Read Review |
| Versatile Liquid Nutrient |  |
Simple Lawn Solutions Balanced Fertilizer | Balanced nutrient profile | Easy to spray | Works on all grasses | View on Amazon | Read Review |
| Phosphorus Free Efficiency |  |
Sunniland St. Augustine Granular Fertilizer | Slow release feeding | Phosphorus free | Calibrated for St. Augustine | View on Amazon | Read Review |
| High Iron Greening |  |
Fertilome Centipede and St. Augustine Fertilizer | High iron content | Balanced nutrient blend | Slow release nitrogen | View on Amazon | Read Review |
| Instant Color Specialist |  |
Scotts Green Max Lawn Food | Noticeable color boost | Fast acting iron | Reliable distribution | View on Amazon | Read Review |
| Universal Maintenance Staple |  |
Scotts Turf Builder Lawn Food | Trusted, classic formula | Easy to use | Widely available | View on Amazon | Read Review |
| Soil Health Optimizer |  |
Andersons PGF Complete Fertilizer | Includes humic acid | Small particle size | Professional quality | View on Amazon | Read Review |
| Large Scale Nourishment |  |
SeedRanch St. Augustine Lawn Fertilizer | High nutrient volume | Great for large lawns | Vigorous growth support | View on Amazon | Read Review |
| Pre-Emergent Weed Barrier |  |
Fertilome St. Augustine Weed Feed | Pre and post-emergent | Targets broadleaf weeds | Specifically for St. Augustine | View on Amazon | Read Review |
More Details on Our Top Picks
-
LESCO St. Augustine Weed and Feed
If you struggle with stubborn broadleaf weeds, this LESCO formula acts like a surgical strike on your lawn. It combines fertilization with Penoxsulam, a potent herbicide designed to eliminate weeds while leaving your St. Augustine grass untouched.
You should choose this if your lawn requires a clean slate rather than just a quick green-up. Because it is a professional-grade product, you must monitor the application rate carefully to prevent burning the turf during heat waves.
- Brand Name:LESCO
- Product Type:Weed and Feed
- Application Method:Granular spreader
- Primary Nutrient Ratio:Nitrogen-heavy
- Key Additives:Penoxsulam
- Additional Feature:Targets difficult broadleaf weeds
- Additional Feature:Professional quality ingredients
- Additional Feature:Supports turf density
-
St. Augustine Liquid Lawn Food
Liquid feedings behave like an intravenous drip for your lawn, providing immediate nutrients to the blades. This gallon jug is perfect if your St. Augustine looks thin or pale and you need to stimulate new runners quickly.
The liquid format absorbs through the leaf surface, which makes it ideal for mid-season corrections. Keep in mind that liquid applications do not last as long as granular pellets, so you will need to plan for more frequent treatments.
- Brand Name:St Augustine Grass Fertilizer
- Product Type:Liquid Fertilizer
- Application Method:Spray
- Key Additives:Growth stimulants
- Additional Feature:Promotes rich green color
- Additional Feature:Supports thicker turf density
- Additional Feature:Easy to apply via hose
-
Simple Lawn Solutions Balanced Fertilizer
This balanced 16-4-8 liquid fertilizer offers a flexible solution for those who want to feed their lawn without committing to a massive granular project. It works well on almost any grass type, providing a steady nutrient flow that keeps the lawn looking fresh.
It is an excellent choice for a regular maintenance schedule during the growing season. While highly effective, remember that liquid nutrients wash away faster than granular options during heavy rainstorms.
- Brand Name:Simple Lawn Solutions
- Product Type:Liquid Fertilizer
- Application Method:Spray
- Primary Nutrient Ratio:16-4-8
- Additional Feature:Concentrated formula
- Additional Feature:Simple hose-end application
- Additional Feature:Fast nutrient uptake
-
Sunniland St. Augustine Granular Fertilizer
Sunniland focuses on slow release nitrogen, which feeds your grass gradually over several weeks. By eliminating phosphorus, this formula protects local water sources from runoff, making it a responsible choice for environmentally conscious lawn owners.
The 20-0-6 ratio is specifically calibrated to meet the high nitrogen demands of St. Augustine grass. Ensure you have a reliable spreader calibrated to the bag settings, as even distribution is the secret to avoiding striping.
- Brand Name:Sunniland
- Product Type:Granular Fertilizer
- Application Method:Granular spreader
- Coverage Area:5,000 sq ft per bag
- Primary Nutrient Ratio:20-0-6
- Additional Feature:Two bag pack
- Additional Feature:Protects local waterways
- Additional Feature:Steady nutrient release
-
Fertilome Centipede and St. Augustine Fertilizer
When your lawn looks tired, iron is the secret ingredient that returns that deep, dark green hue. This 15-0-15 formula provides a balanced diet alongside a high concentration of iron to revitalize warm-season grasses like Centipede and St. Augustine.
It functions as a long-term tonic for your soil. The slow-release nitrogen ensures the lawn does not have a growth explosion followed by a crash, keeping the grass healthy through the heat of summer.
- Brand Name:Fertilome
- Product Type:Granular Fertilizer
- Application Method:Granular spreader
- Primary Nutrient Ratio:15-0-15
- Key Additives:High iron
- Additional Feature:Ideal for warm-season grasses
- Additional Feature:Promotes deep green color
- Additional Feature:Consistent feeding schedule
-
Scotts Green Max Lawn Food
Scotts Green Max is engineered to provide a visual transformation in a very short time. The inclusion of an iron supplement means you will see a noticeable change in color within just a few days of application.
This is your best bet for curb appeal before an event or gathering. Because it is so effective at greening, ensure you sweep any stray granules off your sidewalk or driveway to avoid staining concrete.
- Brand Name:Scotts
- Product Type:Granular Fertilizer
- Application Method:Granular spreader
- Coverage Area:5,000 sq ft
- Key Additives:Iron supplement
- Additional Feature:Quick greening results
- Additional Feature:Easy to spread pellets
- Additional Feature:Enhances visual appeal
-
Scotts Turf Builder Lawn Food
This is the classic choice for homeowners who want a predictable, reliable result without too much fuss. It works across almost all grass types and provides a balanced feeding that supports overall lawn health throughout the season.
If you are new to lawn care, this is a low risk option that provides consistent results. Just keep in mind that it is a general-purpose product, so it lacks the specialized weed control found in more targeted formulas.
- Brand Name:Scotts
- Product Type:Granular Fertilizer
- Application Method:Granular spreader
- Coverage Area:5,000 sq ft
- Additional Feature:All grass types
- Additional Feature:Consistent performance
- Additional Feature:Simple application process
-
Andersons PGF Complete Fertilizer
The addition of 7% Humic DG makes this fertilizer unique, as it feeds the soil microbes alongside the grass blades. Think of it as a vitamin supplement for your lawn that improves long-term nutrient absorption.
This is perfect for the homeowner who views their lawn as a living ecosystem rather than just a green carpet. The small, fine granules ensure that the product reaches the soil surface quickly, minimizing waste.
- Brand Name:The Andersons
- Product Type:Granular Fertilizer
- Application Method:Granular spreader
- Coverage Area:5,000 sq ft
- Primary Nutrient Ratio:16-4-8
- Key Additives:7% Humic DG
- Additional Feature:Improves soil health
- Additional Feature:Efficient nutrient delivery
- Additional Feature:Professional grade results
-
SeedRanch St. Augustine Lawn Fertilizer
With a 24-2-11 ratio, this is a high nitrogen powerhouse designed for vigorous growth. The 50-pound bag is perfect if you have a larger property and need to cover ground without constantly refilling your spreader.
It provides a heavy dose of nutrients to help your St. Augustine recover from stress or drought. Because of its strength, always verify your spreader settings to ensure you do not apply too much at once.
- Brand Name:SeedRanch
- Product Type:Granular Fertilizer
- Application Method:Granular spreader
- Coverage Area:Large areas
- Primary Nutrient Ratio:24-2-11
- Additional Feature:Bulk quantity bag
- Additional Feature:High nitrogen boost
- Additional Feature:Ideal for large estates
-
Fertilome St. Augustine Weed Feed
This granular product uses Atrazine to handle both existing weeds and those that have yet to sprout. It acts as a protective shield for your St. Augustine, allowing the grass to outcompete unwanted invaders.
Use this if you find yourself fighting a constant battle against seasonal weeds. While powerful, you must follow the timing instructions carefully to maximize the effectiveness of the weed control components.
- Brand Name:Fertilome
- Product Type:Weed and Feed
- Application Method:Granular spreader
- Primary Nutrient Ratio:15-0-4
- Key Additives:Atrazine
- Additional Feature:Prevents future weeds
- Additional Feature:Safe for warm-season grass
- Additional Feature:Dual action formula
Frequently Asked Questions
How often should I fertilize my St. Augustine lawn?
Feed your lawn every six to eight weeks during the active growing season. Start your first application once the grass has fully emerged from winter dormancy. Stop fertilizing at least a month before your region's expected first frost date to avoid promoting tender growth that will die in the cold.
Can I fertilize during a hot summer?
You should reduce your application rate during the peak of summer heat. If temperatures consistently stay above 90 degrees Fahrenheit, grass growth slows down and the roots struggle to take up nutrients. Stick to light applications of slow-release products to avoid stressing the turf.
Why is my grass turning yellow after fertilizing?
Yellowing often happens if you apply too much fertilizer at once, causing nitrogen burn. It can also indicate that the soil pH is out of balance, preventing the grass from absorbing the iron it needs. Check your spreader settings and ensure you are watering the lawn immediately after application to push the granules into the soil.
Do I need to water after applying fertilizer?
Yes, you must irrigate your lawn right after spreading the granules. This step is like rinsing a sponge, as it washes the nutrients off the blades and into the root zone where they belong. Without water, the fertilizer stays on the surface and can evaporate or burn the leaf tissue.
Is organic fertilizer better than synthetic?
Organic fertilizers improve soil health over time by adding beneficial organic matter. While they work more slowly than synthetic options, they provide a consistent, gentle feeding that is safer for pets and children. Synthetic versions act faster, which makes them a better choice if you need to repair thin patches quickly.
