You are kneeling in the Saturday morning humidity, staring at a patch of St. Augustine that looks more yellow than green. It is time to provide some targeted nutrition to get those runners moving again.
Picking the Best Fertilizers for St Augustine is like choosing the right fuel for a high performance engine. You need to balance growth with soil health to keep your lawn thick and thriving through the heat. Read on to see which options fit your lawn care routine.
Key Takeaways
- Prioritize fertilizers with a higher nitrogen ratio during the peak growing season to encourage rapid leaf development.
- Look for slow release nitrogen formulas to avoid burning your grass during the intense heat of midsummer.
- Check the iron content on the label if your goal is achieving that deep, dark green color without forcing excessive top growth.
- Choose liquid fertilizers for fast absorption when your grass shows signs of immediate stress or nutrient deficiency.
- Match your product selection to your specific soil conditions, as St. Augustine reacts poorly to excessive salt or improper pH levels.
| Best Patch Fix |  |
Scotts EZ Patch Lawn Repair | Ideal for bare spots | Includes mulch and fertilizer | Easy to apply | View on Amazon | Read Review |
| Versatile Liquid Feed |  |
Simple Lawn Solutions Balanced Fertilizer | Quick nutrient absorption | Easy hose attachment | Balanced NPK ratio | View on Amazon | Read Review |
| Runner Growth Booster |  |
St. Augustine Liquid Lawn Food | Promotes thick growth | Encourages runner spread | Enhances color quality | View on Amazon | Read Review |
| Bulk Professional Choice |  |
SeedRanch St. Augustine Lawn Fertilizer | Excellent for large lawns | High nitrogen content | Professional grade formula | View on Amazon | Read Review |
| Gentle Iron Supplement |  |
Fertilome Centipede St. Augustine Fertilizer | Includes high iron | Slow release nitrogen | Safe for warm-season grasses | View on Amazon | Read Review |
| Rapid Color Enhancer |  |
Scotts Green Max Lawn Food | Quick greening action | Deepens grass color | Good coverage area | View on Amazon | Read Review |
| Total Lawn Defense |  |
BioAdvanced 3-in-1 Weed Feed | Kills weeds effectively | Strengthens grass roots | Simple dual application | View on Amazon | Read Review |
| Reliable Year-Round Feed |  |
Scotts Turf Builder Lawn Food | Proven performance | Deep root development | Wide compatibility | View on Amazon | Read Review |
| Pest Defense Specialist |  |
Scotts SummerGuard Insect Control | Kills lawn insects | Feeds grass simultaneously | Protects against damage | View on Amazon | Read Review |
| Earth Friendly Choice |  |
Milorganite All-Purpose Organic Fertilizer | Organic slow release | Won't burn grass | Multi-use application | View on Amazon | Read Review |
More Details on Our Top Picks
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Scotts EZ Patch Lawn Repair
Fixing bare spots in St. Augustine requires a mixture that holds moisture while providing nutrients. This product acts like a protective blanket for your soil, helping seeds and existing runners take hold in damaged patches. It is perfect if you have a few worn-out areas caused by pets or heavy foot traffic.
Keep in mind that this is designed for spot treatment rather than a full lawn application. You get two bags covering up to 170 square feet, which is plenty for targeted repairs but not enough for a large backyard. Use it to patch small holes so your lawn looks uniform again.
- Brand Name:Scotts
- Product Type:Repair mulch and fertilizer
- Weight Or Volume:3.75 lb (2 pack)
- Coverage Area:170 sq ft
- Primary Function:Patching bare spots
- Additional Feature:Holds moisture effectively
- Additional Feature:Encourages quick regrowth
- Additional Feature:Simple spot application
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Simple Lawn Solutions Balanced Fertilizer
If you prefer a liquid application that absorbs quickly, this 16-4-8 blend is a solid choice. It provides a balanced dose of nitrogen, phosphorus, and potassium, making it a great all-purpose solution for grass that needs a consistent energy boost during the summer. You can attach it directly to your hose for even distribution.
This is best for homeowners who want to avoid the mess of heavy granular bags. It works well on any grass type, so it is a flexible option if you have a mixed lawn. Just remember that liquid fertilizers often require more frequent reapplications than slow-release granular versions.
- Brand Name:Simple Lawn Solutions
- Product Type:Concentrated liquid fertilizer
- Weight Or Volume:32 ounces
- Primary Function:Balanced lawn nutrition
- Key Ingredients:Nitrogen, Phosphorus, Potassium
- Additional Feature:Works on all grasses
- Additional Feature:Fast acting formula
- Additional Feature:Convenient spray application
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St. Augustine Liquid Lawn Food
St. Augustine grass spreads through runners, and this liquid food is specifically formulated to encourage that lateral growth. If you want a thicker, lusher lawn that fills in gaps, this is your go-to. It also helps improve the deep green color that makes a lawn look healthy and well-maintained.
Because it comes in an 8-ounce size, it is meant for smaller lawns or high-impact areas that need a little extra love. You will appreciate how quickly the plants take up the nutrients since it bypasses the soil breakdown process. Just ensure your sprayer is calibrated to avoid over-applying this concentrated formula.
- Brand Name:St Augustine Grass Fertilizer
- Product Type:Liquid lawn food
- Weight Or Volume:8 oz
- Primary Function:Growth and color boost
- Additional Feature:Rapid nutrient uptake
- Additional Feature:Targets runner development
- Additional Feature:Deepens grass pigment
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SeedRanch St. Augustine Lawn Fertilizer
When you have a massive yard to manage, a 50-pound bag is the only way to go. This high-nitrogen blend provides the power your grass needs to stay vibrant throughout the growing season. The 24-2-11 ratio is specifically designed to meet the demanding requirements of St. Augustine grass.
This is a heavy-duty option for someone who is serious about maintaining a large property. Since it comes in such a large volume, make sure you have a reliable spreader ready to handle the weight. It is a straightforward, no-nonsense feed that gets the job done efficiently.
- Brand Name:SeedRanch
- Product Type:Granular fertilizer
- Weight Or Volume:50 lbs
- Primary Function:Large scale feeding
- Key Ingredients:24-2-11 NPK
- Additional Feature:Sustained release profile
- Additional Feature:Supports grass health
- Additional Feature:Great for large properties
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Fertilome Centipede St. Augustine Fertilizer
Iron is the secret ingredient for that vibrant green look, and this 15-0-15 blend delivers it alongside slow-release nitrogen. It is a smart choice for warm-season grasses that might struggle to absorb nutrients in alkaline soils. You can expect a steady feeding that prevents the grass from surging too fast and burning out.
This is a wonderful pick if your grass looks a bit yellow or tired. It is specifically formulated to be safe for St. Augustine, which can be sensitive to certain harsh chemicals. Do keep in mind that the iron content can sometimes stain concrete, so sweep your sidewalks after spreading.
- Brand Name:Fertilome
- Product Type:Granular lawn fertilizer
- Weight Or Volume:16 lbs
- Primary Function:Color and growth
- Key Ingredients:15-0-15 NPK plus iron
- Additional Feature:Prevents nutrient surge
- Additional Feature:Promotes consistent growth
- Additional Feature:Corrects yellowing grass
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Scotts Green Max Lawn Food
Do you want your lawn to pop with color in just a few days? This product combines traditional feeding with an iron supplement to create a deep, emerald tone. It acts like a caffeine shot for your grass, waking it up and making it look healthy in a short time frame.
It covers 5,000 square feet, which makes it a very practical choice for most suburban lawns. Because it emphasizes color, it is perfect for preparing your yard for an upcoming gathering or just general curb appeal. Avoid letting the granules sit on your driveway, as the iron can leave rust-like marks.
- Brand Name:Scotts
- Product Type:Granular fertilizer
- Weight Or Volume:16.67 lbs
- Coverage Area:5,000 sq ft
- Primary Function:Greening and feeding
- Additional Feature:Iron-rich formula
- Additional Feature:Fast results
- Additional Feature:Easy to spread
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BioAdvanced 3-in-1 Weed Feed
Managing weeds while feeding your grass is a challenge, but this granule mix simplifies the process. It acts as both a weed killer and a fertilizer, which saves you from doing two separate jobs. This is essential if you deal with common Southern weeds that try to choke out your St. Augustine runners.
You get a solid 4,000 square feet of coverage, making it a great mid-sized bag for typical lots. It strengthens the turf so it can naturally outcompete future weed growth. Just read the label carefully to ensure you apply it at the correct temperature for the best weed-killing performance.
- Brand Name:BioAdvanced
- Product Type:Weed and feed granules
- Weight Or Volume:10 lb
- Coverage Area:4,000 sq ft
- Primary Function:Weed control and feeding
- Additional Feature:Prevents new weeds
- Additional Feature:Thickens turf density
- Additional Feature:Targeted granular delivery
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Scotts Turf Builder Lawn Food
Sometimes you just need a standard, high-quality fertilizer that works for every season. This is the classic staple for homeowners who want their grass to stay strong without any extra complications. It provides the essential nutrients in a formula that encourages deep roots for a resilient lawn.
It works across all grass types, which is helpful if you have a mix of St. Augustine and other varieties. The 5,000-square-foot coverage is ideal for an average yard. It is a consistent performer that rarely disappoints when you need a simple, reliable maintenance plan.
- Brand Name:Scotts
- Product Type:Granular fertilizer
- Weight Or Volume:12.5 lbs
- Coverage Area:5,000 sq ft
- Primary Function:General maintenance
- Additional Feature:Consistent growth results
- Additional Feature:Improves overall health
- Additional Feature:Simple application process
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Scotts SummerGuard Insect Control
Summer heat often brings out unwanted insects that can destroy your St. Augustine lawn from the roots up. This dual-action product feeds your grass while shielding it from common pests. It is a perfect pre-emptive strike for anyone living in a climate where bugs are a constant summer struggle.
The formulation is designed to keep your grass healthy while the active ingredients handle the infestation. You still get the benefits of a high-quality fertilizer, so you are not sacrificing growth for protection. Always water it in properly after applying to ensure the insecticide reaches the soil where the pests live.
- Brand Name:Scotts
- Product Type:Fertilizer and insecticide
- Weight Or Volume:13.35 lbs
- Coverage Area:5,000 sq ft
- Primary Function:Feeding and pest control
- Additional Feature:Easy to apply
- Additional Feature:Defends against grubs
- Additional Feature:Promotes summer resilience
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Milorganite All-Purpose Organic Fertilizer
If you prefer a non-synthetic approach, this organic-based fertilizer is a fantastic alternative. It provides a slow release of nitrogen that feeds your lawn gently over several weeks, preventing that sudden growth surge that requires constant mowing. It is like an all-you-can-eat buffet that your grass can graze on at its own pace.
The 32-pound bag is a heavy-duty value, and it is versatile enough to use in your flower beds or gardens as well. Because it is organic, it is generally much harder to "burn" your lawn with this product than with high-potency chemicals. It is a sustainable favorite for people who care about soil quality as much as blade height.
- Brand Name:Milorganite
- Product Type:Slow-release nitrogen fertilizer
- Weight Or Volume:32 lb
- Primary Function:Organic soil health
- Key Ingredients:6-4-0 NPK
- Additional Feature:Safe for gardens
- Additional Feature:Gentle nutrient release
- Additional Feature:Eco-friendly composition
Frequently Asked Questions
How often should I fertilize my St. Augustine lawn?
You should aim to fertilize about four times per year, typically starting in the spring once the grass has fully greened up. Space your applications roughly eight weeks apart to ensure the grass has a steady supply of nutrients throughout the growing season.
Can I use a standard lawn fertilizer from the big box store?
Not all generic lawn fertilizers are safe for this grass type. Many standard products contain herbicides like 2,4-D or Atrazine that can severely injure St. Augustine if not applied at the correct rates. Always read the back of the bag to ensure it is safe for St. Augustine specifically.
Why do the tips of my grass turn yellow after fertilizing?
This usually happens because you applied too much nitrogen or did not water the fertilizer in properly. The salt content in the fertilizer draws moisture out of the grass blades, effectively causing a chemical burn.
Is it better to use liquid or granular fertilizer?
Granular fertilizer is generally easier to apply evenly with a spreader and provides a longer feeding duration. Liquid fertilizer offers a fast-acting boost, but it requires more frequent applications to maintain the same level of growth.
Should I water after applying the fertilizer?
Yes, watering is the most important step after you finish spreading the product. Aim to apply about one quarter inch of water to help the nutrients move down into the root zone. This prevents the fertilizer from sitting on the blades where it might cause damage or evaporate into the air.
