Why is my St. Augustine lawn turning yellow instead of that deep, lush green I see in the neighborhood? Keeping this grass happy requires a specific touch because it is sensitive to heat and thrives on consistent, targeted nutrition.
Finding the Best Liquid Fertilizers for St Augustine Grass is the first step toward reclaiming your curb appeal. A few well-timed applications can make a massive difference in density and color. Here is what you need to know to pick the right bottle for your yard.
Key Takeaways
- Prioritize formulas with high nitrogen content to support the vigorous growth and spread of your St. Augustine runners.
- Check the iron levels in the fertilizer to ensure you get that deep, rich color without pushing too much weak top growth.
- Look for added humic acid or seaweed extract to improve your soil quality and help the grass roots absorb nutrients more efficiently.
- Choose a hose end sprayer attachment if you have a large lawn to ensure the liquid application is even and saves you time.
- Verify that the product is labeled as safe for all grass types so you do not accidentally damage your specific turf variety.
| Top Organic Choice |  |
Organic Plant Magic Slow Release Granules | Safe for pets | Sustained slow release | Improves overall soil quality | View on Amazon | Read Review |
| Best All-Rounder |  |
Simple Lawn Solutions Balanced NPK | Balanced nutritional profile | Versatile for all grasses | Encourages steady growth | View on Amazon | Read Review |
| Targeted Growth Specialist |  |
St Augustine Grass Liquid Fertilizer | Specific for St. Augustine | Supports root development | Promotes rich color | View on Amazon | Read Review |
| Nutrient Dense Booster |  |
Simple Lawn Solutions Superior Fertilizer | Rich in organic additives | All season formula | Convenient sprayer included | View on Amazon | Read Review |
| Iron Rich Supplement |  |
Scotts Liquid Green Max Food | Rapid greening effect | Dual action formula | Versatile application | View on Amazon | Read Review |
| Heavy Nitrogen Feed |  |
Scotts Liquid Green Max 29-0-0 | High nitrogen concentration | Quick color improvement | Reliable brand quality | View on Amazon | Read Review |
| Comprehensive Turf Treatment |  |
PetraMax Neighbor’s Envy Fertilizer | Pet safe ingredients | Large coverage area | Comprehensive nutrient blend | View on Amazon | Read Review |
| Reliable Color Booster |  |
Scotts Liquid Green Max 29-0-0 | Consistent performance | Easy to find | High nitrogen levels | View on Amazon | Read Review |
| Standard Maintenance Essential |  |
Scotts Turf Builder Liquid Food | Dependable brand | Easy to apply | Balanced for general growth | View on Amazon | Read Review |
| Deep Root Specialist |  |
Lawn Drench Soil Treatment | Deep root focused | Aids lawn recovery | Soil health improvement | View on Amazon | Read Review |
More Details on Our Top Picks
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Organic Plant Magic Slow Release Granules
If you prefer a natural approach, this option works well for homeowners who prioritize soil health alongside blade growth. It acts like a slow-cooked meal for your grass, providing steady nourishment over time rather than a sudden, fleeting burst.
Because it is organic, you do not have to worry about harsh chemicals affecting your pets or kids. Just keep in mind that since it is a granular product that dissolves, it takes a moment longer to see results compared to a pure liquid spray.
- Brand Name:Organic Plant Magic
- Product Type:Slow release granules
- Total Capacity:20 pounds
- Application Method:Spread and water
- Additional Feature:Truly organic formula
- Additional Feature:Long lasting lawn care
- Additional Feature:Promotes healthy yard growth
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Simple Lawn Solutions Balanced NPK
This is a workhorse for any grass type, but it shines particularly when your St. Augustine needs a balanced feeding schedule. The 16-4-8 ratio provides enough nitrogen to encourage that deep green color without forcing your grass to grow faster than you can mow it.
You will find this especially helpful during the summer months when heat stress usually slows down grass development. Be aware that this concentrate requires a bit of measuring, so keep your mixing bucket handy.
- Brand Name:Simple Lawn Solutions
- Product Type:Concentrated liquid
- Total Capacity:32 ounces
- Nutrient Ratio:16-4-8
- Application Method:Hose end sprayer
- Additional Feature:Spring and summer formula
- Additional Feature:Easy to mix
- Additional Feature:Quality lawn food
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St Augustine Grass Liquid Fertilizer
St. Augustine grass requires specific attention, and this formula is built precisely for its unique needs. It focuses heavily on thickening your turf and encouraging new runners, which is perfect if you have patches that need to fill in.
The high nitrogen formula acts like a shot of caffeine for your lawn. Just be careful not to over-apply, as too much nitrogen can sometimes lead to excessive growth that makes the grass vulnerable to pests.
- Brand Name:St Augustine Grass Fertilizer
- Product Type:Liquid lawn food
- Total Capacity:8 ounces
- Application Method:Mix and feed
- Additional Feature:Fast nutrient delivery
- Additional Feature:Encourages new runners
- Additional Feature:Thickens turf growth
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Simple Lawn Solutions Superior Fertilizer
This blend is packed with extras like humic acid, fish, and seaweed. These ingredients do more than just feed the grass; they condition the soil so your lawn can better uptake nutrients.
It is an excellent choice for an all-season routine. Because it includes both nitrogen and potassium, it prepares your grass for the stresses of changing weather. Since it comes with an attached sprayer, the setup is quite convenient.
- Brand Name:Simple Lawn Solutions
- Product Type:Liquid fertilizer
- Total Capacity:32 ounces
- Nutrient Ratio:15-0-15
- Key Additives:Humic, fish, and seaweed
- Application Method:Attached sprayer
- Additional Feature:Promotes growth and green
- Additional Feature:Improved soil health
- Additional Feature:Easy application system
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Scotts Liquid Green Max Food
Sometimes your grass is healthy but just looks a bit pale. This product is a two-in-one solution that pairs nitrogen with iron to bring back that deep, dark green hue that defines a healthy St. Augustine lawn.
It is simple to use and works on almost any grass type. Just keep in mind that the iron content can leave stains on concrete or walkways, so try to keep the spray focused on the grass.
- Brand Name:Scotts
- Product Type:Fertilizer and iron
- Total Capacity:32 ounces
- Application Method:Liquid spray
- Additional Feature:Iron supplement included
- Additional Feature:Visible results quickly
- Additional Feature:Suitable for any lawn
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Scotts Liquid Green Max 29-0-0
When your lawn is starving for nitrogen, this high-concentration formula is the answer. It is essentially a concentrated energy blast that helps your grass recover from a rough season or heavy foot traffic.
The 29-0-0 ratio means you are getting a very potent nitrogen source. Use this sparingly, as it is designed to provide a massive greening effect rather than a long-term, slow-drip nutritional balance.
- Brand Name:Scotts
- Product Type:Liquid fertilizer
- Total Capacity:32 fluid ounces
- Nutrient Ratio:29-0-0
- Application Method:Liquid spray
- Additional Feature:Iron supplement added
- Additional Feature:For any grass type
- Additional Feature:Professional grade results
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PetraMax Neighbor’s Envy Fertilizer
If you want a product that does everything at once, this seven-in-one concentrate is hard to beat. It combines nitrogen, iron, humic acid, and sea kelp into one bottle to create a complete lawn recovery system.
One major plus is that it is safe for pets, which is a rare find in such a concentrated formula. It covers a large area, making it ideal for those with expansive properties who do not want to keep buying smaller bottles.
- Brand Name:PetraMax
- Product Type:Concentrated liquid
- Total Capacity:1 gallon
- Key Additives:Nitrogen, iron, humic, kelp
- Application Method:Hose end sprayer
- Additional Feature:Deep green turf
- Additional Feature:Covers 16,000 square feet
- Additional Feature:All in one formula
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Scotts Liquid Green Max 29-0-0
This is effectively the same potent formula as the previous Scotts option, providing that signature deep green finish. It is perfect for those who trust the brand and want a consistent result every single time.
The iron supplement is the star here, masking any yellowing that might be occurring due to nutrient deficiencies. It is straightforward and requires no complicated prep work before you start spraying.
- Brand Name:Scotts
- Product Type:Liquid fertilizer
- Total Capacity:32 fluid ounces
- Nutrient Ratio:29-0-0
- Application Method:Liquid spray
- Additional Feature:Iron supplement included
- Additional Feature:Works on any grass
- Additional Feature:Simple liquid application
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Scotts Turf Builder Liquid Food
Sometimes you do not need a specialized miracle; you just need a reliable way to keep your grass fed throughout the season. This formula provides a standard nitrogen boost that keeps your lawn in a steady state of growth.
It is the bread and butter of lawn care. If you are looking for an uncomplicated, effective way to keep your St. Augustine looking sharp, this is a dependable choice that does exactly what the label promises.
- Brand Name:Scotts
- Product Type:Liquid lawn food
- Total Capacity:32 fluid ounces
- Nutrient Ratio:29-0-3
- Application Method:Liquid spray
- Additional Feature:Suitable for any grass
- Additional Feature:Quick and easy
- Additional Feature:Consistent feeding
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Lawn Drench Soil Treatment
This product moves beyond the blades and focuses on the health beneath the surface. It acts as a deep soil treatment, which is vital if your St. Augustine is suffering from compacted or tired soil.
Instead of just forcing leaf growth, it encourages the roots to dive deeper into the earth, resulting in a more resilient lawn. Use this if your grass struggles to survive the hottest parts of the summer.
- Brand Name:Mark and Phil’s
- Product Type:Liquid soil treatment
- Total Capacity:64 ounces
- Nutrient Ratio:15-0-4
- Application Method:Hose end sprayer
- Additional Feature:Covers 3,000 square feet
- Additional Feature:All grass types
- Additional Feature:Soil recovery formula
Frequently Asked Questions
How often should I apply liquid fertilizer to my St. Augustine lawn?
You should aim to feed your lawn every six to eight weeks during the growing season. This keeps the nutrients available consistently without overwhelming the plant.
Can I apply liquid fertilizer and weed killer at the same time?
Many products are designed as weed and feed combinations, which save you a trip around the yard. However, check the label carefully to ensure the herbicide is safe for St. Augustine, as some chemicals can burn this specific grass variety.
Do I need to water the lawn after applying liquid fertilizer?
Most liquid fertilizers are designed to be absorbed through the leaves, so you do not need to water them in immediately. In fact, letting the product dry on the blades for a few hours helps the grass take in the nutrients more efficiently.
Why is my St. Augustine turning yellow even after I fertilize it?
Yellowing often points to an iron deficiency or high soil pH rather than a lack of nitrogen. If your nitrogen levels are sufficient, look for a liquid iron supplement to provide that deep green color you want.
Is liquid fertilizer safer for pets than granular options?
Liquid fertilizers generally soak into the ground or dry on the grass blades faster than granular pellets, which can be eaten by curious pets. Still, always keep your pets off the lawn until the liquid has dried completely to be on the safe side.
