St. Augustine grass is actually quite picky about nutrients despite its reputation for being a tough turf. It acts a bit like a hungry teenager, needing a steady stream of nitrogen to stay lush, yet it will suffer if you feed it the wrong balance during the heat of a Texas summer.
Selecting the right nutrients is the difference between a lawn that looks like a golf course fairway and one that slowly turns to straw. Finding the Best Fertilizers for St Augustine in Texas requires knowing exactly what your soil craves. Stick around to see how these options stack up.
Key Takeaways
- Prioritize formulas with a slow-release nitrogen component to ensure steady growth without causing sudden, weak surges that attract pests.
- Check the phosphorus levels carefully, as many Texas soils already contain enough of this nutrient and adding extra can be unnecessary.
- Incorporate iron supplements if your grass looks pale or yellow, as this micro-nutrient is vital for that deep, dark green pigment.
- Match your chosen product to your specific application method, choosing granular for broad coverage or liquid if you prefer spot-treating specific zones.
- Pay close attention to seasonal timing, as you must avoid heavy nitrogen applications during the peak heat of mid-summer to prevent burning your roots.
| Best All-Rounder |  |
Sunniland St. Augustine Weed and Feed | Dual action formula | Targets weeds effectively | Designed for St. Augustine | View on Amazon | Read Review |
| Flexible Liquid Feeding |  |
Simple Lawn Solutions Balanced 16-4-8 Fertilizer | Absorbs quickly | Easy to spray | Balanced nutrient profile | View on Amazon | Read Review |
| Iron Rich Formula |  |
Fertilome 15-0-15 Centipede and St. Augustine Fertilizer | High iron content | Slow release nitrogen | Deepens grass color | View on Amazon | Read Review |
| Heavy Duty Professional |  |
SeedRanch St. Augustine 24-2-11 Fertilizer | High nitrogen concentration | Large bag size | Rapid growth promotion | View on Amazon | Read Review |
| Targeted Growth Booster |  |
St. Augustine Liquid Lawn Food | Promotes new runners | Fast nutrient delivery | Simple mixing | View on Amazon | Read Review |
| Trusted Grass Nutrition |  |
Scotts Turf Builder Lawn Food | Consistent results | Easy to spread | Good for all seasons | View on Amazon | Read Review |
| Defense Against Pests |  |
Scotts Turf Builder SummerGuard Insect Control | Fertilizer and insecticide | Protects against damage | Simple two-in-one application | View on Amazon | Read Review |
| Phosphorus Free Choice |  |
Sunniland St. Augustine 20-0-6 Fertilizer | Phosphorus free | Slow release nitrogen | Large volume supply | View on Amazon | Read Review |
| Instant Color Fix |  |
Scotts Liquid Green Max Fertilizer | Rapid greening effect | Iron supplement | Easy to apply | View on Amazon | Read Review |
| High Nitrogen Efficiency |  |
Spectracide 30-0-0 Liquid Fertilizer | High nitrogen content | No burn formula | Quick and slow release | 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 treat your lawn and handle those pesky broadleaf weeds simultaneously, this is your primary choice. It works specifically for St. Augustine grass, which can be sensitive to harsh chemicals.
You get a solid balance of nutrients that helps your lawn recover from the heat. Just remember to apply it when the grass is slightly damp so the granules stick to the weeds effectively. It is a bit heavy to haul around, but the results are worth the effort.
- Brand Name:Sunniland
- Application Type:Granular
- Coverage Area:5,000 sq ft
- Additional Feature:Weed control included
- Additional Feature:Promotes thick turf
- Additional Feature:Easy spreader application
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Simple Lawn Solutions Balanced 16-4-8 Fertilizer
Liquid fertilizers are like a quick energy drink for your lawn. This balanced formula is perfect if you want to provide consistent nutrients throughout the growing season without the bulk of granular bags.
It is particularly useful for smaller patches or areas where you need a rapid green-up before a big event. The liquid format ensures you do not have to worry about granules burning your grass if you get the dilution right.
- Brand Name:Simple Lawn Solutions
- Formula Ratio:16-4-8
- Application Type:Liquid spray
- Bag Weight:32 ounces
- Additional Feature:Spring and summer use
- Additional Feature:Highly concentrated
- Additional Feature:Works on all grasses
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Fertilome 15-0-15 Centipede and St. Augustine Fertilizer
Sometimes your grass looks pale because it lacks iron, not just nitrogen. This formula uses a high iron content to push that deep, dark green color that makes your neighbors jealous.
It is a slow-release option, which means you feed the lawn over a longer period. This keeps the grass growing steadily rather than forcing a frantic spurt that requires constant mowing.
- Brand Name:Fertilome
- Formula Ratio:15-0-15
- Bag Weight:16 lbs
- Key Benefit:Deep green color
- Additional Feature:Slow-release technology
- Additional Feature:Supports warm-season grasses
- Additional Feature:Prevents nutrient leaching
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SeedRanch St. Augustine 24-2-11 Fertilizer
When you have a large property to maintain, a 50-pound bag is your best friend. This high-nitrogen mix provides a massive boost to tired, thinning St. Augustine lawns.
It is designed for serious maintenance where you need to cover a lot of ground in one pass. Be sure your spreader settings are calibrated correctly because this is a potent blend.
- Brand Name:SeedRanch
- Formula Ratio:24-2-11
- Bag Weight:50 lbs
- Additional Feature:Professional grade
- Additional Feature:Efficient coverage
- Additional Feature:Promotes root health
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St. Augustine Liquid Lawn Food
If you see bare patches or slow growth in your runners, this liquid concentrate is a helpful tool. It delivers a concentrated nitrogen dose directly to the roots to stimulate new growth.
It is simple to mix and apply with a hose-end sprayer. Keep in mind that because it is a liquid, you will need to apply it more frequently than granular options to keep the momentum going.
- Brand Name:Unknown
- Bag Weight:8 oz
- Key Benefit:Thicker growth
- Additional Feature:Supports root development
- Additional Feature:Easy to apply
- Additional Feature:Rich color enhancement
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Scotts Turf Builder Lawn Food
Sometimes you just need a reliable, standard fertilizer that works without any complex instructions. This is a classic choice for anyone looking to strengthen their lawn against the typical stresses of the Texas heat.
It is widely available and very consistent. While it is a generalist product, it does a dependable job of keeping St. Augustine healthy and lush throughout the year.
- Brand Name:Scotts
- Coverage Area:5,000 sq ft
- Bag Weight:12.5 lbs
- Additional Feature:Universal grass compatibility
- Additional Feature:Reliable performance
- Additional Feature:Simple application
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Scotts Turf Builder SummerGuard Insect Control
Texas summers are brutal, and pests like chinch bugs love to attack stressed St. Augustine. This product solves two problems at once by providing essential nutrients while keeping insects away.
It is a great choice if you notice small, brown patches that seem to spread quickly. Using this as a preventative measure can save you from a major infestation later in the season.
- Brand Name:Scotts
- Coverage Area:5,000 sq ft
- Bag Weight:13.35 lbs
- Additional Feature:Insect control included
- Additional Feature:Summer stress relief
- Additional Feature:Thickens turf density
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Sunniland St. Augustine 20-0-6 Fertilizer
If your soil already has enough phosphorus, adding more can actually harm your lawn or local water sources. This formula skips the phosphorus to provide a targeted nitrogen hit that focuses purely on leaf and runner growth.
The slow-release nitrogen ensures your lawn doesn't get a sudden, unsustainable burst. It is a smart, environmentally conscious way to keep your St. Augustine looking sharp.
- Brand Name:Sunniland
- Formula Ratio:20-0-6
- Coverage Area:5,000 sq ft per bag
- Bag Weight:20 lbs
- Additional Feature:Two pack value
- Additional Feature:Granular form
- Additional Feature:Safe for established lawns
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Scotts Liquid Green Max Fertilizer
When your lawn looks yellow and sad, iron is usually the missing piece of the puzzle. This liquid spray acts as a color supplement that makes your grass look vibrant almost immediately.
It is not a replacement for regular feeding, but it acts as an excellent bridge between granular applications. Just spray it on and let the iron do the heavy lifting for your curb appeal.
- Brand Name:Scotts
- Bag Weight:32 oz
- Key Benefit:Vibrant color
- Additional Feature:Two-in-one formula
- Additional Feature:Works on any grass
- Additional Feature:Quick absorption
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Spectracide 30-0-0 Liquid Fertilizer
This high-nitrogen formula is perfect for pushing growth without the risk of burning the leaf blades. The mix of quick and slow release nitrogen means you get an immediate color boost that stays for weeks.
It is an efficient way to feed a large area with a liquid product. You will appreciate how quickly it revitalizes thin areas of your lawn.
- Brand Name:Spectracide
- Formula Ratio:30-0-0
- Coverage Area:5,000 sq ft
- Bag Weight:32 oz
- Additional Feature:Thickens growth
- Additional Feature:Liquid convenience
- Additional Feature:Three pack value
Frequently Asked Questions
How much fertilizer should I apply per thousand square feet?
A good rule of thumb is to apply one pound of nitrogen per 1,000 square feet during each application. Always check the label on your specific bag to see how many pounds of product are required to hit that target. Over-applying can lead to fertilizer burn, which turns your lawn into a patchy mess of yellow and brown.
Can I use a weed and feed product on St. Augustine?
You must be careful because St. Augustine is sensitive to many common herbicides. Look specifically for products labeled as safe for St. Augustine to avoid killing your grass alongside the weeds. If you are unsure, it is safer to apply fertilizer and weed control as two separate steps.
Should I water the lawn after fertilizing?
Yes, watering is essential to help the nutrients move into the root zone. Aim for about a quarter inch of water shortly after application to wash the granules off the leaf blades. This prevents the fertilizer from scorching the grass in the hot Texas sun.
Why is my lawn yellow even though I fertilize it?
Yellowing often points to iron deficiency or high soil pH rather than a lack of nitrogen. If the veins of the leaves stay green while the rest turns yellow, your soil likely needs an iron supplement. You should also verify that your mower blades are sharp, as dull blades leave ragged tips that can appear yellow or white.
Is it better to use liquid or granular fertilizer?
Granular fertilizer is usually better for the average homeowner because it provides long term feeding through slow release pellets. Liquid options work faster for a quick green-up, but they require much more frequent applications to maintain results. Most professionals prefer granular for the consistent, reliable growth it offers over several months.
