Most Texas lawns do not actually need phosphorus, yet many bags sitting on store shelves are loaded with it. St. Augustine grass is a hungry grower that prefers specific nitrogen ratios to thrive in the heat.
Choosing the Best Fertilizers for St Augustine Grass in Texas requires ignoring the generic marketing on the front of the bag. Stick to the nutrient balance that matches your specific soil health. Let’s look at the options.
Key Takeaways
- Prioritize fertilizers with a high nitrogen content to support the lateral spread of your runners.
- Check the label for iron if your grass looks yellow, as this provides a deep green color without forcing rapid, weak growth.
- Choose granular options for broad, even coverage across your entire lawn area.
- Utilize liquid formulas for immediate plant absorption when the soil is already warm and dry.
- Always apply weed and feed products only when you are certain your specific weeds are listed on the label.
| Best All-Around Performer |  |
Sunniland St. Augustine Weed and Feed | Controls broadleaf weeds | Formulated for St. Augustine | Steady nutrient release | View on Amazon | Read Review |
| Rapid Nutrient Delivery |  |
St. Augustine Liquid Lawn Food | Promotes rapid greening | Supports new runner growth | Easy to spray application | View on Amazon | Read Review |
| Targeted Bare Spot Fix |  |
Scotts EZ Patch Repair Mix | Repairs bare spots | Includes mulch and fertilizer | Retains essential moisture | View on Amazon | Read Review |
| Professional Grade Strength |  |
SeedRanch St. Augustine 24-2-11 Fertilizer | High nutrient concentration | Supports vigorous growth | Bulk package size | View on Amazon | Read Review |
| Iron Rich Formula |  |
Fertilome Centipede and St. Augustine Fertilizer | High iron content | Slow-release nitrogen | Supports multiple grass types | View on Amazon | Read Review |
| Versatile Liquid Food |  |
Simple Lawn Solutions Balanced Fertilizer | Balanced nutrient blend | Easy to spray | Fast-acting nutrients | View on Amazon | Read Review |
| Reliable Seasonal Maintenance |  |
Scotts Turf Builder Lawn Food | Consistent growth results | Strengthens against drought | Easy to find | View on Amazon | Read Review |
| Eco-Conscious Turf Care |  |
Sunniland Phosphorus Free Lawn Fertilizer | Phosphorus free | Encourages deep roots | Slow-release nitrogen | View on Amazon | Read Review |
| Instant Color Booster |  |
Scotts Liquid Green Max | Rapid color improvement | Dual-action iron supplement | Simple spray application | View on Amazon | Read Review |
| Pest Fighting Nutrition |  |
Scotts SummerGuard Insect Control | Fertilizer and insect control | Protects against damage | Seasonal protection | View on Amazon | Read Review |
More Details on Our Top Picks
-
Sunniland St. Augustine Weed and Feed
This is your go-to option if you want to tackle unsightly weeds while feeding your grass at the same time. It is specifically formulated for the unique biology of St. Augustine, meaning it provides the necessary nutrients without the risk of burning your lawn like some generic formulas might.
Just keep in mind that this is a granular product, so you need to distribute it with a reliable spreader to avoid striping. It excels at keeping the turf thick and healthy during the brutal Texas summer months.
- Brand:Sunniland
- Coverage:5,000 sq ft
- Type:Granular
- Additional Feature:Dual action formula
- Additional Feature:Convenient bag size
- Additional Feature:Easy to apply
-
St. Augustine Liquid Lawn Food
Sometimes your grass looks a bit tired and needs a fast-acting boost to get back on track. This liquid formula is excellent for encouraging new runners and achieving that deep green color that makes neighbors jealous.
Because it is a liquid, the grass absorbs the nutrients almost immediately. Be careful not to over-apply, as liquid fertilizers lack the long-term staying power of slow-release granules.
- Brand:St. Augustine
- Type:Liquid
- Additional Feature:Concentrated liquid formula
- Additional Feature:Encourages lateral spread
- Additional Feature:Fast absorption rate
-
Scotts EZ Patch Repair Mix
We all have those annoying spots where the grass just refuses to grow. This repair mix combines mulch and fertilizer to provide a cozy environment for your existing runners to fill in those troublesome gaps quickly.
It functions like a bandage for your lawn, holding moisture in place while delivering a light dose of food. It is not meant for the whole yard, so save this strictly for high-traffic or damaged zones.
- Brand:Scotts
- Coverage:170 sq ft
- Weight:3.75 lb
- Additional Feature:Pre-mixed ingredients
- Additional Feature:Encourages thick growth
- Additional Feature:Protects delicate sprouts
-
SeedRanch St. Augustine 24-2-11 Fertilizer
If you manage a larger property, buying in bulk is the smartest move. This blend offers a high-nitrogen ratio that is perfect for sustaining growth during the peak of the Texas growing season.
It provides a significant punch of nutrients, so make sure your spreader is calibrated correctly before you start walking. This is a workhorse product for those who take their lawn maintenance seriously.
- Brand:SeedRanch
- Formulation:24-2-11
- Weight:50 lbs
- Additional Feature:Commercial style fertilizer
- Additional Feature:Long-lasting bag
- Additional Feature:Efficient application
-
Fertilome Centipede and St. Augustine Fertilizer
Iron is the secret ingredient for that dark green hue every gardener wants. This formula delivers a perfect balance of nutrients alongside high iron content to keep your grass vibrant even when the sun is intense.
It uses slow-release nitrogen, which means your grass gets fed steadily over time instead of getting a sudden, unsustainable spike. It is a fantastic choice for keeping St. Augustine healthy without forcing it to grow too fast.
- Brand:Fertilome
- Formulation:15-0-15
- Weight:16 lbs
- Additional Feature:Steady nutrient release
- Additional Feature:Enhances color quality
- Additional Feature:High-season performance
-
Simple Lawn Solutions Balanced Fertilizer
This liquid spray is incredibly convenient if you want to cover your lawn without lugging around heavy bags. The balanced NPK ratio ensures your grass gets a little bit of everything it needs to stay strong and resilient.
It works on almost any grass type, making it a great versatile tool to have in the garage. Just remember that liquid applications need to be repeated more frequently than granular ones to maintain the effect.
- Brand:Simple Lawn Solutions
- Formulation:16-4-8
- Type:Liquid
- Additional Feature:Spring and summer use
- Additional Feature:Concentrated formula
- Additional Feature:Multi-grass compatibility
-
Scotts Turf Builder Lawn Food
Sometimes you just need a standard, dependable fertilizer that works every time. This classic option from Scotts is designed to strengthen your lawn against heat and drought, which is essentially a requirement for living in Texas.
It is easy to find, easy to apply, and consistent in its results. It is the definition of a no-nonsense product for a homeowner who wants a good-looking lawn without over-complicating the process.
- Brand:Scotts
- Coverage:5,000 sq ft
- Weight:12.5 lbs
- Additional Feature:All-season utility
- Additional Feature:Even particle size
- Additional Feature:Simple application
-
Sunniland Phosphorus Free Lawn Fertilizer
Many soils already have enough phosphorus, so adding more can actually be counterproductive. This phosphorus-free formula focuses on nitrogen and potassium to push healthy growth and build strong root systems without unnecessary additives.
It is a great choice if you are trying to be mindful of your local runoff while still giving your grass exactly what it needs to thrive. The slow-release design ensures the nitrogen sticks around for the long haul.
- Brand:Sunniland
- Formulation:20-0-6
- Weight:40 lbs (20 lb per bag)
- Additional Feature:Eco-friendly nutrient balance
- Additional Feature:St. Augustine specific
- Additional Feature:Large coverage area
-
Scotts Liquid Green Max
When your lawn looks pale or yellow, this is the solution to bring it back to life. It is a two-in-one product that provides a quick shot of fertilizer plus a healthy dose of iron to fix color issues within days.
It is not a replacement for a full fertilization program, but it is a perfect mid-season supplement when you need an immediate aesthetic improvement. Just spray it on and watch the color shift.
- Brand:Scotts
- Type:Liquid
- Additional Feature:Fast absorption
- Additional Feature:Non-staining formula
- Additional Feature:Improves overall appearance
-
Scotts SummerGuard Insect Control
Texas summers bring out all the bugs that want to feast on your lawn. This product is a dual-threat that feeds your grass while simultaneously killing troublesome insects that might otherwise ruin your hard work.
Using this in the summer helps you save time by tackling two problems in a single application. It is the ultimate tool for a homeowner who wants to protect their turf from both nutrient deficiency and hungry pests.
- Brand:Scotts
- Coverage:5,000 sq ft
- Weight:13.35 lbs
- Additional Feature:Multi-purpose formula
- Additional Feature:Summer pest resistance
- Additional Feature:Granular application
Frequently Asked Questions
How often should I fertilize my St. Augustine grass during the Texas summer?
You should fertilize every six to eight weeks during the peak growing season. Just be careful to water the lawn thoroughly after each application to prevent the fertilizer from burning the grass in the intense heat.
Why does my grass turn yellow even after I fertilize it?
This is usually a sign of iron deficiency, which happens frequently in alkaline Texas soils. Adding a supplement with chelated iron will help turn your lawn back to a vibrant green without changing the soil chemistry too drastically.
Is it safe to fertilize when the temperature is over 90 degrees?
It is generally risky to apply heavy nitrogen loads when temperatures are consistently in the 90s or higher. The grass is often stressed by heat, and extra fertilizer can force growth that the roots cannot support. Wait for a cooler morning or a mild stretch of weather to apply your products.
Should I water my lawn immediately after applying fertilizer?
Yes, watering is essential to move the nutrients down into the root zone where they can actually do some good. Aim for about one quarter inch of water to ensure the granules dissolve and settle into the soil.
What is the best NPK ratio for St. Augustine grass?
Look for a balanced or nitrogen-heavy ratio like 21-0-0 or 15-5-10. These ratios provide the necessary nitrogen for leaf growth while offering enough phosphorus and potassium to keep the root system strong throughout the year.
