Many homeowners treat their lawn like a generic patch of green, choosing the first bag of plant food they see on a store shelf. This usually leads to patchy growth or worse, scorched blades that struggle to recover under the intense southern sun.
Understanding the specific biological needs of your turf is the secret to a thick, vibrant yard. These are the Best Fertilizers for St Augustine Grass in Florida that help you avoid common mistakes and keep your landscape looking healthy all year.
Key Takeaways
- Look for fertilizers that include a high percentage of slow-release nitrogen to ensure steady growth without forcing an unhealthy spike.
- Always check the label for Atrazine if you need to tackle weeds, as this chemical effectively manages invasive plants while remaining safe for your grass.
- Choose liquid formulas when you want quick absorption for immediate greening, but rely on granular options for long-term nutrient storage in the soil.
- Avoid products with high phosphorus levels unless a soil test confirms a deficiency, as excess phosphorus can run off into local water supplies.
- Match your purchase to your specific project, such as choosing a spot-repair patch kit for dead patches or a broadcast fertilizer for general maintenance.
| Best All-Rounder |  |
Sunniland St. Augustine Weed and Feed | Dual action convenience | Florida specific formulation | Consistent coverage | View on Amazon | Read Review |
| Fast Acting Nutrition |  |
Simple Lawn Solutions 16-4-8 Liquid Fertilizer | Quick nutrient uptake | Easy liquid application | Versatile for any grass | View on Amazon | Read Review |
| Thickening Growth Specialist |  |
St. Augustine Liquid Lawn Food | Encourages new runners | Promotes intense greening | Fast nutrient delivery | View on Amazon | Read Review |
| Targeted Spot Treatment |  |
Scotts EZ Patch Lawn Repair | Holds moisture effectively | Simplifies patch repairs | Contains growth nutrients | View on Amazon | Read Review |
| Heavy Duty Weed Control |  |
Fertilome St. Augustine Weed and Feed | Strong weed killing ability | Safe for St. Augustine | Long lasting granules | View on Amazon | Read Review |
| Reliable Maintenance Staple |  |
Scotts Turf Builder Lawn Food | Widely available | Simple to apply | Steady nutrient release | View on Amazon | Read Review |
| Pest Defense Solution |  |
Scotts SummerGuard Lawn Food | Combats insects effectively | Feeds during summer heat | Convenient 2-in-1 formula | View on Amazon | Read Review |
| Iron Rich Greener |  |
Scotts Liquid Green Max | Rapid greening effect | Easy hose attachment | Added iron content | View on Amazon | Read Review |
| Classic Weed Fighter |  |
Scotts Turf Builder Weed and Feed | Effective weed control | Trusted performance history | Easy to find | View on Amazon | Read Review |
| Sustained Growth Feed |  |
Sunniland Slow Release Nitrogen | Phosphorus free | Slow release nitrogen | Long lasting results | View on Amazon | Read Review |
More Details on Our Top Picks
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Sunniland St. Augustine Weed and Feed
This is the go-to choice for homeowners who want to handle both nutrition and weed control in one pass. It is specifically formulated for Florida lawns, meaning it respects the unique biology of St. Augustine grass without causing the stress that generic products might trigger.
You get a granular application that covers a decent amount of ground effectively. Just remember that because it contains a herbicide, you must apply it when the grass is dry and avoid using it on newly seeded areas.
- Brand Name:Sunniland
- Formula Type:Granular
- Coverage Area:5000 square feet
- Primary Purpose:Weed and feed
- Additional Feature:Targets broadleaf weeds
- Additional Feature:Promotes healthy blade growth
- Additional Feature:Simple spreader application
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Simple Lawn Solutions 16-4-8 Liquid Fertilizer
If you need to jumpstart a lagging lawn, this liquid formula is your best friend. The balanced NPK ratio allows for rapid absorption through the leaf blades, which is much faster than waiting for granules to break down in the soil.
It works well for a mid-summer boost when the grass is thirsty but needs a gentle touch. Since it is a concentrate, you will need a hose-end sprayer to get the right dilution before walking your lawn.
- Brand Name:Simple Lawn Solutions
- Formula Type:Liquid concentrate
- Key Ingredients:16-4-8 NPK ratio
- Primary Purpose:General lawn food
- Additional Feature:Ready to spray
- Additional Feature:Supports summer growth
- Additional Feature:Highly concentrated formula
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St. Augustine Liquid Lawn Food
Focusing on runner development and root health, this liquid food helps your St. Augustine spread across thin patches. It is a high-nitrogen solution, which is exactly what this grass type craves to maintain that deep, dark green color we all want.
Because it is a liquid, you can target specific areas that look a bit sparse without wasting product on the rest of the yard. Be sure to water it in lightly if you want to ensure the nutrients reach the soil level.
- Brand Name:Unbranded
- Formula Type:Liquid
- Primary Purpose:Growth and thickening
- Additional Feature:Supports deep roots
- Additional Feature:Easy mix instructions
- Additional Feature:High nitrogen content
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Scotts EZ Patch Lawn Repair
St. Augustine grass often develops bare spots from pets or foot traffic, and this mulch and fertilizer blend is the perfect patch kit. It holds moisture near the grass roots, creating a small greenhouse environment that encourages the existing turf to spread into the gap.
This is not intended for the entire lawn, so use it sparingly where you see visible damage. It acts as a safety blanket for struggling roots while they try to reestablish.
- Brand Name:Scotts
- Formula Type:Mulch and fertilizer mix
- Coverage Area:170 square feet
- Bag Weight:3.75 lbs
- Primary Purpose:Lawn repair
- Additional Feature:Two pack convenience
- Additional Feature:Protects new growth
- Additional Feature:Easy to spread
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Fertilome St. Augustine Weed and Feed
When weeds are threatening to take over your yard, this granule mix is a reliable heavy lifter. It includes Atrazine, which is a powerhouse for tackling both pre-emergent and post-emergent weeds while remaining safe for your St. Augustine turf.
It is a more aggressive approach than standard fertilizers, so follow the application rates carefully to avoid burning the grass. This is the product to reach for when the clover and dandelions are getting out of hand.
- Brand Name:Fertilome
- Formula Type:Granular
- Bag Weight:25.6 lbs
- Key Ingredients:15-0-4 NPK and Atrazine
- Primary Purpose:Weed control
- Additional Feature:Pre-emergent protection
- Additional Feature:Post-emergent herbicide
- Additional Feature:Granular distribution
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Scotts Turf Builder Lawn Food
Sometimes you just need a standard, dependable feeding to keep your grass ticking over through the season. This formula provides a steady stream of nutrients that keeps the lawn fed without any fancy bells or whistles.
It is easy to find and works reliably with standard spreaders. While it lacks weed control, it is a great choice if you are happy with your current weed management and just want a lush, healthy lawn.
- Brand Name:Scotts
- Formula Type:Granular
- Coverage Area:5000 square feet
- Bag Weight:12.5 lbs
- Primary Purpose:General feeding
- Additional Feature:Consistent growth results
- Additional Feature:Works on all grasses
- Additional Feature:Improves turf density
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Scotts SummerGuard Lawn Food
Florida summers bring heat and a swarm of unwanted insects, and this product tackles both issues at once. It combines lawn food and insecticide into one application, saving you the trouble of managing two separate products.
It is specifically designed to handle common turf pests while giving the grass the nutrients it needs to survive high temperatures. Just keep in mind that you should avoid applying this if you plan on having pets or children on the lawn immediately after treatment.
- Brand Name:Scotts
- Formula Type:Granular
- Coverage Area:5000 square feet
- Bag Weight:13.35 lbs
- Primary Purpose:Fertilizer and insect control
- Additional Feature:Protects against grubs
- Additional Feature:Enhances summer resilience
- Additional Feature:Easy spreader usage
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Scotts Liquid Green Max
If your lawn looks yellow or pale despite regular feeding, it might just need a dose of iron. This liquid supplement acts like a vitamin boost that turns the grass a deep, vibrant green within a day or two.
You can use it alongside your regular fertilizer program without worrying about over-feeding. It is a quick way to improve the visual appeal of your curb without stimulating excess growth that requires constant mowing.
- Brand Name:Scotts
- Formula Type:Liquid
- Primary Purpose:Greening and food
- Additional Feature:2-in-1 supplement
- Additional Feature:Rapid absorption
- Additional Feature:No heavy growth spike
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Scotts Turf Builder Weed and Feed
This is a standard, widely trusted formula for clearing out common invaders like dandelion and clover. It feeds the grass while simultaneously working to eliminate broadleaf weeds, making it a solid choice for routine maintenance in the spring.
The granule size is designed for easy spreading, ensuring an even distribution across your lawn. Always check the weather forecast before applying, as you want to avoid rain washing the treatment away before it has a chance to work.
- Brand Name:Scotts
- Formula Type:Granular
- Coverage Area:5000 square feet
- Bag Weight:14.29 lbs
- Primary Purpose:Weed and feed
- Additional Feature:Targets clover
- Additional Feature:Clears out dandelions
- Additional Feature:Promotes thicker turf
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Sunniland Slow Release Nitrogen
Constant growth is not always the goal, as sometimes you want a slow and steady feeding that lasts for weeks. This phosphorus-free formula uses slow-release nitrogen to keep the grass healthy without forcing it to grow faster than you can mow it.
It is a great choice for Florida environmental standards, as avoiding excess phosphorus helps protect our local waterways. The 20-pound bags provide plenty of coverage for the average yard.
- Brand Name:Sunniland
- Formula Type:Granular
- Coverage Area:5000 square feet per bag
- Bag Weight:20 lbs per bag
- Key Ingredients:20-0-6 NPK
- Primary Purpose:Sustained feeding
- Additional Feature:Environmentally conscious
- Additional Feature:Prevents nutrient leaching
- Additional Feature:Two pack value
Frequently Asked Questions
How often should I fertilize my St. Augustine grass?
You should aim to fertilize your lawn about four times per year during the active growing season. Avoid applying fertilizer in the middle of winter when the grass is dormant, as the nutrients will simply wash away into the groundwater without being absorbed.
Will this fertilizer kill my weeds?
Most standard fertilizers only provide nutrients and do not contain chemicals to kill weeds. If you have an infestation, you might need a weed and feed product, but be aware that some herbicides can harm St. Augustine if the temperature is too high.
Can I over-fertilize my lawn?
Yes, applying too much fertilizer, especially nitrogen, can cause fungal outbreaks and attract chinch bugs. Always follow the application rate listed on the bag, as more is rarely better when it comes to chemical lawn care.
Should I water the lawn after applying fertilizer?
You should always water your lawn lightly after applying granules to help the nutrients move into the soil. This process, called watering in, prevents the fertilizer from burning the leaf blades and helps the roots absorb the minerals efficiently.
Is it safe for my pets to walk on the grass after fertilizing?
You should keep pets and children off the treated area until the fertilizer has been fully watered in and the blades are completely dry. Checking the specific product label is the best way to determine the exact waiting period for your chosen brand.
