Many homeowners grab the first bag of green pellets they see at the hardware store without checking the label. This is a quick way to burn your lawn or invite a weed invasion.
Choosing the Best St Augustine Grass Fertilizers requires matching the chemistry to your soil needs. A little homework goes a long way toward a thicker yard, so stay tuned for the right choices.
Key Takeaways
- Prioritize formulas with slow release nitrogen to encourage consistent growth while avoiding the surge of stress that leads to disease.
- Check if your selected bag contains Atrazine or similar herbicides if you need to tackle weeds while you feed the grass.
- Verify the NPK ratio to ensure you are not over-applying phosphorus, which can be restricted in some regions for environmental health.
- Choose between liquid sprays for rapid absorption or granular bags for long-term feeding based on your time and equipment.
- Look for added iron content if your primary goal is to shift your lawn from a pale yellow to a deep, healthy green.
| Best Overall Performer |  |
LESCO St. Augustine Weed and Feed | Controls broadleaf weeds effectively | Professional grade formulation | Ideal for large lawns | View on Amazon | Read Review |
| Growth Acceleration Specialist |  |
Liquid St. Augustine Lawn Food | Promotes dense runner growth | Rapid nutrient absorption | Deepens grass color | View on Amazon | Read Review |
| Versatile Seasonal Booster |  |
Simple Lawn Solutions Balanced Liquid | Balanced nutrient profile | Works on any grass | Concentrated liquid formula | View on Amazon | Read Review |
| Phosphorus Free Efficiency |  |
Sunniland St. Augustine Granular Fertilizer | Slow release nitrogen technology | Phosphorus free formulation | Covers 5,000 square feet | View on Amazon | Read Review |
| Iron Rich Greening |  |
Fertilome Centipede and St. Augustine Fertilizer | High iron for color | Slow release nitrogen | Safe for warm-season grasses | View on Amazon | Read Review |
| Instant Color Transformation |  |
Scotts Green Max Lawn Food | Rapid greening effect | Iron supplement included | Covers 5,000 square feet | View on Amazon | Read Review |
| Reliable Maintenance Staple |  |
Scotts Turf Builder Lawn Food | Consistent growth results | Strengthens root systems | Easy to spread granules | View on Amazon | Read Review |
| High Nitrogen Powerhouse |  |
SeedRanch St. Augustine Turf Fertilizer | High nitrogen content | Large bag size | Potent nutrient ratio | View on Amazon | Read Review |
| Holistic Growth Solution |  |
Superior Liquid Lawn Food | Includes humic acid | Easy sprayer attachment | All season formula | View on Amazon | Read Review |
| Targeted Weed Eradicator |  |
Fertilome St. Augustine Weed Control | Contains Atrazine | Pre and post-emergent | Safe for warm-season lawns | View on Amazon | Read Review |
More Details on Our Top Picks
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LESCO St. Augustine Weed and Feed
If you want to tackle stubborn weeds while feeding your turf, this is your primary choice. It utilizes Penoxsulam to target problematic invaders without harming the health of your St. Augustine grass.
Because this is a heavy-duty 50-pound bag, it is ideal for covering large residential properties. Just be careful with your application timing, as you need to ensure the product stays on the foliage long enough to work its magic.
- Brand:LESCO
- Weight:50 lbs
- Specialty Features:Includes Penoxsulam weed control
- Additional Feature:Dual action weed and feed
- Additional Feature:Professional strength granules
- Additional Feature:Wide area coverage
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Liquid St. Augustine Lawn Food
Sometimes your grass needs a quick boost rather than a slow granular release. This liquid formula is designed to stimulate new runners and fill in thin patches throughout your lawn.
It is a fantastic tool for homeowners who want a deep green color in a short amount of time. Keep in mind that liquid applications require more frequent intervals than granular options to sustain results.
- Brand:St. Augustine Grass Fertilizer
- Formulation:Liquid
- Weight:1 Gallon
- Additional Feature:Fast acting formula
- Additional Feature:Encourages lateral spreading
- Additional Feature:Easy spray application
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Simple Lawn Solutions Balanced Liquid
This balanced 16-4-8 mix serves as a reliable all-purpose feed for various grass types. It provides a steady diet of nutrients that keeps your lawn resilient during the heat of summer.
You will find it particularly useful for spot treatment or supplemental feeding when the grass shows signs of stress. Since it is concentrated, you must dilute it properly before applying it to your soil.
- Brand:Simple Lawn Solutions
- Formulation:Liquid
- Weight:32 Ounce
- Nutrient Ratio:16-4-8
- Additional Feature:Spring and summer use
- Additional Feature:Highly concentrated spray
- Additional Feature:Convenient container size
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Sunniland St. Augustine Granular Fertilizer
Many local regulations discourage the use of phosphorus because of environmental runoff concerns. This 20-0-6 granular blend keeps your lawn lush while remaining strictly compliant with those standards.
The slow release nitrogen ensures that your grass receives a steady stream of food rather than a single sudden burst. It is a solid, no-nonsense choice for maintaining healthy soil health over the long term.
- Brand:Sunniland
- Formulation:Granular
- Weight:20 lbs per bag
- Coverage:5,000 sq ft per bag
- Nutrient Ratio:20-0-6
- Additional Feature:Two pack bundle
- Additional Feature:Environmentally conscious formula
- Additional Feature:Consistent turf feeding
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Fertilome Centipede and St. Augustine Fertilizer
If your lawn looks a bit yellow, this 15-0-15 formula provides the perfect corrective measure. The addition of high iron content works quickly to restore a vibrant, healthy color to your turf.
It acts as a slow-release feed that supports warm-season grasses throughout the growing season. Just remember that iron can stain concrete, so sweep any stray granules off your walkways immediately.
- Brand:Fertilome
- Weight:16 lbs
- Nutrient Ratio:15-0-15
- Additional Feature:Specifically for warm-season turf
- Additional Feature:Intense greening effect
- Additional Feature:Controlled nitrogen release
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Scotts Green Max Lawn Food
Think of this as a vitamin supplement for your lawn. It combines traditional feeding with a heavy dose of iron to ensure your grass looks exceptionally deep green within days.
This is a great choice if you have a social gathering coming up and want the yard to look its best. It does not provide weed control, so use it purely for aesthetic enhancement.
- Brand:Scotts
- Weight:16.67 lbs
- Coverage:5,000 sq. ft.
- Additional Feature:Fast acting iron supplement
- Additional Feature:Suitable for all grass
- Additional Feature:Visible results quickly
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Scotts Turf Builder Lawn Food
This is the classic choice for homeowners who want a predictable, reliable feeding schedule. It provides the essential nutrients required for strong roots and thick, healthy grass blades.
Because it is designed for every grass type, you do not need to worry about complex compatibility issues. It is a straightforward product for routine lawn care.
- Brand:Scotts
- Weight:12.5 lbs
- Coverage:5,000 sq. ft.
- Additional Feature:Universal grass application
- Additional Feature:Thickens turf density
- Additional Feature:Long standing industry standard
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SeedRanch St. Augustine Turf Fertilizer
When you have a large area that needs a heavy dose of nutrients, this 50-pound bag is the workhorse you need. The 24-2-11 ratio is quite potent, providing a significant boost to your grass.
This is best for established lawns that require aggressive growth support. Due to the high nitrogen content, ensure you water it in thoroughly to prevent burning the blades.
- Brand:SeedRanch
- Weight:50 lbs
- Nutrient Ratio:24-2-11
- Additional Feature:Ideal for large lawns
- Additional Feature:Promotes rapid growth
- Additional Feature:Bulk quantity packaging
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Superior Liquid Lawn Food
This unique blend does more than just feed the grass; it supports the overall soil ecosystem. With added humic acid, fish, and seaweed, it encourages health from the roots up.
The attached sprayer makes application simple for anyone who wants to avoid heavy bags. It is a great choice for those who prefer an organic-adjacent approach to lawn maintenance.
- Brand:Simple Lawn Solutions
- Formulation:Liquid
- Weight:32 Ounce
- Nutrient Ratio:15-0-15
- Additional Feature:Fish and seaweed additives
- Additional Feature:Improves soil health
- Additional Feature:Convenient ready to spray
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Fertilome St. Augustine Weed Control
Containing Atrazine, this product is highly effective at stopping weeds before or after they appear. It is specifically formulated to be safe for St. Augustine grass while being tough on invasive plants.
Use this when you notice pre-emergent needs or existing broadleaf weeds causing trouble. It is a specialized tool, so apply it according to the label to achieve the best results.
- Brand:Fertilome
- Weight:25.6 lbs
- Nutrient Ratio:15-0-4
- Additional Feature:Broadleaf weed control
- Additional Feature:Granular application method
- Additional Feature:Prevents future weed growth
Frequently Asked Questions
How often should I fertilize my St. Augustine grass?
You should aim to fertilize your lawn three to four times per year during the active growing season. Start your first application in the spring once the danger of frost has passed and the grass has fully greened up.
Can I fertilize while the lawn is dormant?
Avoid applying fertilizer while the grass is brown and dormant in the winter. The roots are not actively taking up nutrients, so the chemicals will likely just leach into the groundwater or wash away with rain. Wait until the grass shows signs of new green growth before spreading any product.
Is it better to use a weed and feed product?
Weed and feed products are convenient, but they require precise timing to be effective. You must apply them when weeds are actively growing, but you also need to ensure the air temperature is moderate to avoid damaging the grass. Many professionals prefer to treat weeds separately so they can fertilize the grass exactly when it needs nutrients.
What should I do if I accidentally apply too much fertilizer?
If you notice dark green streaks or patches that look scorched, you have likely over-applied the product. Water the area deeply and immediately to help flush the excess salts through the soil profile. Keep the lawn hydrated for the next few days to help the grass recover from the nutrient spike.
Do I need to water after applying granular fertilizer?
Yes, watering is essential to help the granules move down to the soil level where the roots can access them. Use a light irrigation cycle of about one quarter inch of water shortly after application. This step also washes any dust off the leaf blades, which helps prevent potential leaf burn.
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