Texas soil is a unique beast. St. Augustine grass thrives in our heat, but only if you provide the specific nutrients it craves. Matching your fertilizer to our local clay or sandy loam is the secret to a lawn that stays lush rather than just surviving the summer.
Choosing the Best Fertilizers for St Augustine Grass in Texas requires patience and an eye for the NPK ratio. Fertilizer is like a balanced diet for your backyard. If you get the minerals right, the grass handles the rest of the work.
Key Takeaways
- Prioritize fertilizers with a low phosphorus content because many Texas soils already contain enough of this nutrient.
- Choose slow release nitrogen formulas to ensure your grass gets a steady supply of food over several weeks instead of one giant burst.
- Check the iron content if your goal is a deep, dark green color without forcing excessive grass growth.
- Verify the square footage coverage listed on the bag to avoid overpaying for more product than your lawn actually requires.
- Match your specific maintenance goal, such as weed control versus growth stimulation, before selecting a liquid or granular product.
| Best All-Rounder |  |
Sunniland St. Augustine Weed and Feed | Dual action formula | Specifically for St. Augustine | Covers 5000 square feet | View on Amazon | Read Review |
| Quick Nutrient Boost |  |
Simple Lawn Solutions 16-4-8 Liquid Fertilizer | Rapid nutrient uptake | Balanced NPK ratio | Easy spray application | View on Amazon | Read Review |
| Targeted Slow Release |  |
Sunniland St. Augustine Granular Fertilizer | Sustained feeding cycle | Phosphorus free | Professional grade results | View on Amazon | Read Review |
| Runner Growth Specialist |  |
St. Augustine Liquid Lawn Food | Encourages new runners | High nitrogen content | Fast nutrient delivery | View on Amazon | Read Review |
| Patchwork Restoration Expert |  |
Scotts EZ Patch Lawn Repair | All-in-one repair solution | Protects new seedlings | Specifically for St. Augustine | View on Amazon | Read Review |
| Seasonal Maintenance Staple |  |
Scotts Turf Builder Lawn Food | Trusted brand performance | Consistent growth results | Easy to apply | View on Amazon | Read Review |
| Nutrient Dense Supplement |  |
Superior 15-0-15 Liquid Fertilizer | Includes humic acid | Contains fish and seaweed | All season application | View on Amazon | Read Review |
| Broadleaf Weed Eliminator |  |
Scotts Turf Builder Weed and Feed | Controls dandelion and clover | Feeds and weeds simultaneously | Easy granular application | View on Amazon | Read Review |
| High Iron Specialist |  |
Fertilome Centipede and St. Augustine Fertilizer | High iron content | Slow release nitrogen | Targeted for warm-season grasses | View on Amazon | Read Review |
| Immediate Color Enhancer |  |
Scotts Liquid Green Max | Rapid greening effect | Liquid iron supplement | Easy to spray | View on Amazon | Read Review |
More Details on Our Top Picks
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Sunniland St. Augustine Weed and Feed
If you want to handle your lawn care chores in one go, this is your primary choice. It combines weed control with essential nourishment to keep your St. Augustine thick and healthy.
The formula is specifically tailored for this grass type, which is notorious for being sensitive to harsh chemicals. Just be careful not to apply it when the temperatures in Texas climb above 85 degrees, as you might risk stressing your grass.
- Brand Name:Sunniland
- Formula Type:Granular
- Coverage Area:5000 sq ft
- Application Method:Broadcast spreader
- Key Feature:Weed control included
- Additional Feature:Kills broadleaf weeds
- Additional Feature:Promotes dense growth
- Additional Feature:Easy to spread
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Simple Lawn Solutions 16-4-8 Liquid Fertilizer
Sometimes your grass looks a bit tired and just needs a quick pick-me-up. This liquid formula is designed for rapid absorption, providing a balanced diet of nitrogen, phosphorus, and potassium.
It works exceptionally well during the spring and summer months when your lawn is actively growing. Because it is a liquid, you will need a hose-end sprayer, which makes it perfect for targeting specific thin spots rather than covering the whole yard.
- Brand Name:Simple Lawn Solutions
- Formula Type:Liquid concentrate
- Primary Nutrient:16-4-8 Nitrogen balance
- Application Method:Hose-end spray
- Key Feature:Fast acting formula
- Additional Feature:Professional grade ingredients
- Additional Feature:Works on all grasses
- Additional Feature:Encourages vibrant green color
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Sunniland St. Augustine Granular Fertilizer
Steady growth is the secret to a resilient lawn, and this slow-release nitrogen formula delivers just that. It feeds your grass over a longer period, which prevents that cycle of rapid growth followed by a sudden crash.
Since this is phosphorus-free, it is a smart pick if your soil already has high phosphorus levels. It provides the steady nutrition St. Augustine needs to build a strong root system during the heat of a Texas summer.
- Brand Name:Sunniland
- Formula Type:Granular
- Primary Nutrient:20-0-6 Nitrogen
- Coverage Area:5000 sq ft per bag
- Application Method:Broadcast spreader
- Key Feature:Slow release nitrogen
- Additional Feature:Promotes deep root growth
- Additional Feature:Environmentally conscious formula
- Additional Feature:Consistent greening effect
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St. Augustine Liquid Lawn Food
St. Augustine grass spreads by sending out runners, and this liquid fertilizer is formulated to accelerate that process. If you are trying to fill in bare spots or thicken up a patchy lawn, this is the tool for the job.
It delivers a high nitrogen punch that encourages deep, lush green color. Because it is a liquid, the nutrients go straight to the foliage for an almost immediate visual change.
- Brand Name:Generic/Specialty
- Formula Type:Liquid concentrate
- Application Method:Hose-end spray
- Key Feature:Promotes grass runners
- Additional Feature:Rapid greening effect
- Additional Feature:Supports root development
- Additional Feature:Easy to mix
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Scotts EZ Patch Lawn Repair
We have all dealt with those annoying bare spots that refuse to grow back. This repair mix combines mulch and fertilizer in one package to help jumpstart regrowth on your St. Augustine.
Think of it as a first-aid kit for your turf. You simply clear the dead area, apply the mix, and keep it moist, which creates a stable environment for new blades to take hold.
- Brand Name:Scotts
- Formula Type:Granular and mulch
- Coverage Area:170 sq ft
- Application Method:Manual spread
- Key Feature:Lawn repair mulch
- Additional Feature:Retains vital moisture
- Additional Feature:Encourages quick germination
- Additional Feature:Simple two-step application
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Scotts Turf Builder Lawn Food
Reliability is the hallmark of this classic product. It is a straightforward fertilizer that provides the essential nutrients your lawn needs to handle the stresses of daily life in Texas.
It is designed to be used throughout the growing season. While it lacks weed killers, its simplicity makes it a great choice if you prefer to manage your weeds separately from your feeding schedule.
- Brand Name:Scotts
- Formula Type:Granular
- Coverage Area:5000 sq ft
- Application Method:Broadcast spreader
- Key Feature:Essential lawn nutrition
- Additional Feature:Builds strong roots
- Additional Feature:Improves heat tolerance
- Additional Feature:Feeds for six weeks
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Superior 15-0-15 Liquid Fertilizer
This liquid solution is packed with extra goodies like humic acid, fish, and seaweed. These ingredients do more than just feed the grass, as they also help improve your soil health over time.
The 15-0-15 ratio is excellent for maintaining color and strength without pushing too much weak, succulent growth. It is an ideal mid-season supplement to keep your lawn looking like a golf course fairway.
- Brand Name:Simple Lawn Solutions
- Formula Type:Liquid concentrate
- Primary Nutrient:15-0-15 Nitrogen Potassium
- Application Method:Attached sprayer
- Key Feature:Added micronutrients
- Additional Feature:Improves soil quality
- Additional Feature:Boosts plant vigor
- Additional Feature:Easy hose attachment
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Scotts Turf Builder Weed and Feed
When dandelions and clover start taking over your yard, you need a heavy hitter. This product does double duty by killing common weeds while simultaneously feeding your grass.
You must be diligent about timing with this one, as it works best when the weeds are actively growing and the dew is on the grass. It is a practical solution for homeowners who want a clean, weed-free lawn without the manual labor of digging them up.
- Brand Name:Scotts
- Formula Type:Granular
- Coverage Area:5000 sq ft
- Application Method:Broadcast spreader
- Key Feature:Weed control included
- Additional Feature:Thickens the lawn
- Additional Feature:Fast acting formula
- Additional Feature:Trusted quality control
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Fertilome Centipede and St. Augustine Fertilizer
If your lawn looks yellowish despite regular feeding, it might be suffering from an iron deficiency. This fertilizer is loaded with extra iron to ensure your St. Augustine stays a rich, deep shade of green.
The slow-release nitrogen formula ensures your lawn gets a steady diet rather than a quick spike. It is a fantastic choice for Texas soils that tend to be alkaline, as it helps counteract the yellowing often seen in these conditions.
- Brand Name:Fertilome
- Formula Type:Granular
- Primary Nutrient:15-0-15 with Iron
- Application Method:Broadcast spreader
- Key Feature:High iron supplement
- Additional Feature:Deep greening effect
- Additional Feature:Sustained growth pattern
- Additional Feature:Professional quality mix
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Scotts Liquid Green Max
This is the equivalent of a quick coat of paint for your lawn. The 2-in-1 formula combines fertilizer with a significant dose of iron to provide a rapid visual improvement within days.
It is perfect for the homeowner who wants their lawn to look great before a weekend party. While it provides a great color boost, keep in mind that it acts as a supplement to your regular feeding routine rather than a total replacement.
- Brand Name:Scotts
- Formula Type:Liquid
- Application Method:Hose-end spray
- Key Feature:2-in-1 iron/fertilizer
- Additional Feature:Works on all grass
- Additional Feature:Rapid absorption
- Additional Feature:Simple application process
Frequently Asked Questions
How often should I fertilize my St. Augustine grass?
You should aim to feed your lawn about three to four times per year. Start your first application in the spring once the grass has fully greened up and stop by early autumn to let the lawn prepare for winter.
Is it better to fertilize before or after it rains?
It is almost always better to apply fertilizer just before a light rain or a scheduled irrigation cycle. This helps wash the granules off the leaf blades and into the soil where the roots can start working on them.
Will fertilizer help if I have brown patches?
Brown patches are often caused by fungus rather than a lack of nutrients, so adding more fertilizer can actually make the problem worse. You should identify the cause first, because applying nitrogen to a diseased lawn is like pouring gasoline on a fire.
Can I use a weed and feed product?
You can, but you must be very careful to choose a product specifically labeled as safe for St. Augustine. Many broadleaf weed killers will severely damage or kill this type of grass if the concentration is too high.
How much fertilizer should I put down?
Always follow the application rate printed on the back of the bag based on your lawn's square footage. More is rarely better, as applying too much nitrogen can burn your lawn and lead to excessive thatch buildup over time.
