Many homeowners grab the first green bottle they see, assuming all lawn food works the same. St. Augustine grass actually requires specific care to prevent yellowing and thinning.
Using the Best Liquid Fertilizers for St Augustine Grass means choosing formulas that balance immediate iron hits with long term nourishment. Read on to discover how these solutions help your yard stay vibrant and dense throughout the growing season.
Key Takeaways
- Prioritize formulas with an iron supplement if your soil needs help correcting a pale or yellowing appearance.
- Check the NPK ratio on the label to ensure the nitrogen content aligns with the active growth phase of your lawn.
- Opt for hose end sprayer attachments if you want to cover large areas quickly without needing a separate tank or pump.
- Look for added micronutrients like seaweed or humic acid to improve soil quality alongside basic grass nutrition.
- Measure your total square footage carefully to avoid buying too much or too little concentrate for your yard size.
| Best Patch Fixer |  |
Scotts EZ Patch Lawn Repair | Combines mulch and fertilizer | Retains essential moisture | Encourages rapid turf repair | View on Amazon | Read Review |
| Balanced Growth Booster |  |
Simple Lawn Solutions 16-4-8 Fertilizer | Balanced nutrient profile | Easy liquid application | Promotes steady greening | View on Amazon | Read Review |
| Targeted Runner Support |  |
St. Augustine Grass Liquid Food | Enhances runner growth | Promotes deep color | Thickens turf density | View on Amazon | Read Review |
| Iron-Rich Color Enhancer |  |
Scotts Liquid Green Max Food | Rapid greening results | Includes supplemental iron | Versatile for any grass | View on Amazon | Read Review |
| Nutrient Dense Bio-Stimulant |  |
Simple Lawn Solutions Kelp Fertilizer | Contains fish and seaweed | Improves soil health | Balanced nutrient blend | View on Amazon | Read Review |
| High-Coverage Lawn Tonic |  |
PetraMax Neighbor’s Envy Fertilizer | Large coverage area | Comprehensive nutrient list | Deep greening properties | View on Amazon | Read Review |
| Potent Potassium Booster |  |
Superior 15-0-15 Liquid Fertilizer | High potassium content | Attached hose sprayer included | Promotes root strength | View on Amazon | Read Review |
| High-Nitrogen Growth Fuel |  |
Sunday Green Machine Fertilizer | High nitrogen content | Includes sprayer hardware | Lush growth stimulator | View on Amazon | Read Review |
| Maximum Nitrogen Strength |  |
Scotts Liquid Green Max 29-0-0 | Very high nitrogen | Iron included for color | Fast acting liquid | View on Amazon | Read Review |
| Reliable Bulk Greening |  |
Scotts Green Max Value Pack | Consistent nutrient levels | Strong nitrogen boost | Excellent for regular use | View on Amazon | Read Review |
More Details on Our Top Picks
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Scotts EZ Patch Lawn Repair
When you have bald spots in your St. Augustine that just won't quit, this mulch and fertilizer blend is your best friend. It acts like a healing bandage for your soil, keeping the area moist while delivering the nutrients needed for the grass to spread.
It is specifically designed for smaller repair jobs rather than feeding your entire lawn. Keep in mind that it covers about 170 square feet, so it is not meant for broad, full-yard maintenance.
- Brand Name:Scotts
- Product Type:Mulch and fertilizer mix
- Total Capacity:3.75 lb
- Targeted Use:Lawn repair
- Additional Feature:Holds water for seeds
- Additional Feature:Contains starter nutrients
- Additional Feature:Ready to apply
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Simple Lawn Solutions 16-4-8 Fertilizer
If you want a steady, reliable feeding for your lawn, this balanced formula provides exactly what the grass needs during the peak growing months. The 16-4-8 ratio gives your St. Augustine the nitrogen boost it craves for deep green color without forcing too much top growth at once.
This is a concentrated spray designed for easy use with a standard hose-end attachment. It is an excellent choice for a consistent, seasonal routine throughout the spring and summer.
- Brand Name:Simple Lawn Solutions
- Product Type:Liquid lawn food
- Total Capacity:32 Ounce
- Application Method:Hose spray
- Nutrient Ratio:16-4-8
- Additional Feature:Concentrated formula
- Additional Feature:Simple setup
- Additional Feature:Works on any grass
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St. Augustine Grass Liquid Food
St. Augustine grass thrives by spreading through runners, and this liquid food is formulated to encourage that exact growth pattern. It is a compact solution for homeowners who want to see their lawn thicken up in specific areas.
The small size makes it a convenient option for targeted care, though you will need more for a very large yard. It is a focused way to get that rich, deep green look we all want.
- Brand Name:St Augustine Grass Fertilizer
- Product Type:Liquid lawn food
- Total Capacity:8 oz
- Targeted Use:St. Augustine lawns
- Additional Feature:Concentrated nutrient blend
- Additional Feature:Fast absorption
- Additional Feature:Supports lush blades
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Scotts Liquid Green Max Food
When your grass looks a bit pale, this 2-in-1 formula is the quickest way to wake it up. By combining fertilizer with a generous dose of iron, it forces the lawn to produce a deep, emerald green that catches everyone's eye.
It works on any grass type, making it a versatile tool for your shed. Just be careful around sidewalks, as the iron content can leave rusty stains on concrete if you are not precise with your aim.
- Brand Name:Scotts
- Product Type:Fertilizer and iron supplement
- Total Capacity:32 oz
- Application Method:Spray
- Additional Feature:Dual action formula
- Additional Feature:Fast acting results
- Additional Feature:Clear application instructions
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Simple Lawn Solutions Kelp Fertilizer
This fertilizer goes beyond basic nitrogen by adding fish and seaweed kelp to the mix. These organic ingredients improve the soil health and help your St. Augustine resist the stress of summer heat.
The 16-4-8 ratio ensures your lawn gets the core macronutrients it needs while the additives provide secondary support. It is a great choice if you prefer a more holistic approach to lawn care.
- Brand Name:Simple Lawn Solutions
- Product Type:Liquid lawn fertilizer
- Total Capacity:1 Quart
- Application Method:Concentrated spray
- Nutrient Ratio:16-4-8
- Additional Feature:Organic kelp extract
- Additional Feature:Supports heat resistance
- Additional Feature:Easy mixing ratio
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PetraMax Neighbor’s Envy Fertilizer
If you have a large property, you will appreciate how far this concentrated gallon can reach. It is a heavy-duty mixture that packs nitrogen, iron, humic acid, and sea kelp into one bottle to keep your lawn looking like the best on the block.
Because it covers up to 16,000 square feet, you will not need to reload your sprayer constantly. It is essentially a complete meal for your turf in a single jug.
- Brand Name:PetraMax
- Product Type:Liquid lawn concentrate
- Total Capacity:1 Gallon
- Nutrient Ratio:7-in-1 formula
- Additional Feature:Includes humic acid
- Additional Feature:Contains seaweed extract
- Additional Feature:Professional grade strength
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Superior 15-0-15 Liquid Fertilizer
Sometimes your lawn needs a strong foundation more than a quick growth spurt, and that is where this high-potassium formula shines. It helps your grass build strong root systems, which is critical for surviving cold winters or dry, hot summers.
It comes with an attached sprayer, which saves you the headache of finding the right mixing equipment. This is a no-nonsense fertilizer for those who want to prepare their lawn for changing seasons.
- Brand Name:Simple Lawn Solutions
- Product Type:Liquid lawn fertilizer
- Total Capacity:32 Ounce
- Application Method:Attached sprayer
- Nutrient Ratio:15-0-15
- Additional Feature:Includes humic acid
- Additional Feature:Contains fish emulsion
- Additional Feature:All-season use
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Sunday Green Machine Fertilizer
This is a high-octane formula designed specifically for maximum green growth. With a 22-0-3 ratio, it is heavy on the nitrogen, making it the perfect choice for a lawn that has been sluggish and needs a serious kick.
The kit includes a hose-end sprayer, so you can walk your yard and apply it evenly without any fuss. It is a convenient 2-pack that provides enough fuel for 10,000 square feet of turf.
- Brand Name:Sunday
- Product Type:Liquid lawn fertilizer
- Total Capacity:84 oz total
- Application Method:Hose-end sprayer
- Nutrient Ratio:22-0-3
- Additional Feature:Seaweed additives included
- Additional Feature:Rapid absorption formula
- Additional Feature:Covers large areas
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Scotts Liquid Green Max 29-0-0
When you need to turn a faded lawn into a lush carpet, this high-nitrogen version is your go-to solution. The 29-0-0 ratio is quite powerful, so it is best used when your grass is actively growing and ready to process that energy.
The addition of iron ensures that the growth you get is a rich, dark green rather than a weak yellow. Use it to keep your lawn looking vibrant and healthy all season long.
- Brand Name:Scotts
- Product Type:Liquid fertilizer
- Total Capacity:32 fl. oz.
- Application Method:Spray
- Nutrient Ratio:29-0-0
- Additional Feature:Iron supplement included
- Additional Feature:Deep greening result
- Additional Feature:Simple pour application
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Scotts Green Max Value Pack
Having an extra bottle of this liquid fertilizer on hand is a smart move for consistent lawn maintenance. Because it features the same 29-0-0 high-nitrogen formula, you get the same reliable performance that keeps your St. Augustine thick and colorful.
It is a straightforward product that does not require any guesswork. Keep it stored in a cool place, and you will always be ready for the next monthly feeding cycle.
- Brand Name:Scotts
- Product Type:Liquid lawn fertilizer
- Total Capacity:32 fl. oz.
- Nutrient Ratio:29-0-0
- Additional Feature:Includes iron supplement
- Additional Feature:Versatile application
- Additional Feature:Fast results
Frequently Asked Questions
How often should I apply liquid fertilizer to my St. Augustine lawn?
You should aim to feed your lawn every 4 to 6 weeks during the active growing season. If you use a product with a higher nitrogen count, stick to the longer end of that window to avoid stressing the grass.
Can I apply liquid fertilizer when the temperature is very high?
Avoid spraying during the heat of the day, as the liquid can evaporate before it reaches the roots and potentially scorch the blades. Instead, apply your treatment in the early morning when the grass is cool and the soil has better moisture retention.
Do I need to water the lawn after applying liquid fertilizer?
Yes, giving your lawn a light watering after application helps move the nutrients into the root zone where they are most effective. Aim for about quarter-inch of water to ensure the fertilizer reaches the soil without washing it away entirely.
Will liquid fertilizer kill weeds in my St. Augustine grass?
Most standard liquid fertilizers only provide nutrients and will not address weed problems. If you have an infestation, look for a weed and feed combination product specifically labeled as safe for St. Augustine grass.
How do I know if I have applied too much fertilizer?
Watch for yellowing or brown streaks appearing on your lawn a few days after application. This condition, known as nitrogen burn, usually happens when you use too much product or fail to water it in properly.
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