Many homeowners assume that any generic turf food will work for their Florida lawn. This often leads to yellowing blades or unintended damage because St. Augustine grass has unique needs that standard feeds simply cannot meet.
Finding the Best Fertilizers for St Augustine Grass in Florida requires understanding your soil chemistry and specific growth phases. By picking the right formula, you keep your yard healthy and lush despite our intense humidity. Let's explore these top options to help you maintain a beautiful lawn all year.
Key Takeaways
- Prioritize granular fertilizers with slow release nitrogen to ensure your grass gets a steady supply of nutrients rather than a quick, unsustainable surge.
- Always check for the presence of atrazine if your primary goal is controlling stubborn weeds like dandelion or clover without harming your St. Augustine.
- Match your product choice to the current season, as high nitrogen feeds are best for active summer growth while iron-rich supplements help maintain color during cooler months.
- Opt for liquid applications if you need rapid absorption, but keep in mind that granular options provide longer lasting coverage for larger properties.
- Verify that your selected bag covers your specific square footage to avoid underfeeding or wasting money on excessive product.
| Best Overall Choice |  |
Sunniland St. Augustine Weed & Feed | Dual action formula | Targets specific Florida weeds | Perfect for 5000 square feet | View on Amazon | Read Review |
| Rapid Nutrient Delivery |  |
Simple Lawn Solutions 16-4-8 Liquid | Absorbs quickly | Boosts green color fast | Easy spray application | View on Amazon | Read Review |
| Growth Stimulant Specialist |  |
Liquid St. Augustine Lawn Food | Promotes runners | Increases turf thickness | Professional liquid quality | View on Amazon | Read Review |
| Bare Spot Fixer |  |
Scotts EZ Patch Repair Mix | Convenient patch mix | Includes fertilizer | Easy spot treatment | View on Amazon | Read Review |
| Sustained Nitrogen Feed |  |
Sunniland 20-0-6 Slow Release Fertilizer | Slow release technology | Phosphorus free | Professional grade granular | View on Amazon | Read Review |
| Reliable General Maintenance |  |
Scotts Turf Builder Lawn Food | Versatile application | Builds root strength | Trusted brand performance | View on Amazon | Read Review |
| Seasonal Protection Powerhouse |  |
Scotts SummerGuard Insect Control | Fertilizer plus insecticide | Ideal for summer | Prevents pest damage | View on Amazon | Read Review |
| Instant Color Booster |  |
Scotts Liquid Green Max | Deepens green color | High iron content | Works very fast | View on Amazon | Read Review |
| Broadleaf Weed Eliminator |  |
Scotts Turf Builder Weed & Feed | Kills common weeds | Feeds grass simultaneously | Effective granular spread | View on Amazon | Read Review |
| Professional Grade Control |  |
Fertilome St. Augustine Weed & Feed | Pre and post emergent | Safe for St. Augustine | Powerful granule formula | View on Amazon | Read Review |
More Details on Our Top Picks
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Sunniland St. Augustine Weed & Feed
If you want a reliable foundation for your Florida lawn, this product is the local standard. It combines essential nutrients with effective weed control to address the most common issues St. Augustine grass faces in our humid climate.
You get a balanced approach that feeds the turf while keeping unwanted intruders at bay. Just remember that because it includes an active weed killer, you should avoid using it during the hottest summer months when the grass is already under environmental stress.
- Brand Name:Sunniland
- Formula Type:Granular
- Coverage Area:5000 square feet
- Primary Purpose:Weed control and fertilization
- Additional Feature:Specifically formulated for St. Augustine
- Additional Feature:Easy to spread granules
- Additional Feature:Supports thick turf density
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Simple Lawn Solutions 16-4-8 Liquid
Sometimes your grass looks a bit tired and needs a fast pick-me-up. This liquid spray is excellent for providing a quick boost of nitrogen, which acts like a jolt of espresso for your lawn to encourage that deep green color we all want.
Because it is a liquid, your grass absorbs the nutrients through both the roots and the blades. It is a fantastic tool to keep in your shed for mid-season touchups when you do not want to commit to a full granular application.
- Brand Name:Simple Lawn Solutions
- Formula Type:Liquid concentrate
- Total Weight:32 ounces
- Primary Purpose:General lawn nutrition
- Key Ingredient:Nitrogen, Phosphorus, Potassium
- Additional Feature:Balanced 16-4-8 ratio
- Additional Feature:Works on any grass
- Additional Feature:Concentrated for large areas
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Liquid St. Augustine Lawn Food
If your goal is to push new runners and fill in thin patches, this liquid formula is your best friend. It provides the targeted nutrition necessary to encourage the lateral growth that makes St. Augustine lawns look lush and full.
While it excels at promoting density, it is not a complete lawn care solution for weeds. You will need to pair this with a separate control product if you are fighting a heavy infestation of broadleaf invaders.
- Brand Name:Generic
- Formula Type:Liquid
- Total Weight:1 Gallon
- Primary Purpose:Encouraging thick growth
- Additional Feature:Enhances green color
- Additional Feature:Easy to apply via hose
- Additional Feature:Supports root health
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Scotts EZ Patch Repair Mix
Every lawn has that one high traffic area that refuses to cooperate. This patch repair mix is designed to fix those unsightly dead zones by combining mulch and fertilizer into one convenient package.
It is specifically meant for spot treatment rather than a whole yard broadcast. Use it to fill in holes or worn areas, and make sure you keep the area consistently moist to get the best results from the included nutrients.
- Brand Name:Scotts
- Formula Type:Mulch and fertilizer mix
- Total Weight:3.75 lbs
- Coverage Area:170 square feet
- Primary Purpose:Lawn repair
- Additional Feature:Two pack included
- Additional Feature:Specifically for St. Augustine
- Additional Feature:Simplifies bare spot care
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Sunniland 20-0-6 Slow Release Fertilizer
If you prefer a set it and forget it approach to lawn care, this slow release granular fertilizer is the way to go. It provides a steady drip of nitrogen over several weeks, which prevents the surges of growth that often lead to more frequent mowing.
This formula is entirely phosphorus free, which is a great choice if you are mindful of local runoff regulations or have soil that is already rich in that nutrient. It is a no-nonsense granular option for the diligent homeowner.
- Brand Name:Sunniland
- Formula Type:Granular
- Total Weight:20 lbs per bag
- Coverage Area:5000 square feet per bag
- Primary Purpose:Steady growth
- Additional Feature:Two pack convenience
- Additional Feature:High nitrogen content
- Additional Feature:Supports overall health
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Scotts Turf Builder Lawn Food
When you just need a solid, dependable fertilizer to keep your grass fed throughout the season, this is the default choice for many. It is versatile enough to work on all grass types, meaning you do not have to worry if your lawn has mixed patches.
It focuses on building strong roots, which is vital for Florida lawns that face intense heat stress. While it is a great all-rounder, it does not contain weed killers, so it is best used as a preventative feeding program.
- Brand Name:Scotts
- Formula Type:Granular
- Total Weight:12.5 lbs
- Coverage Area:5000 square feet
- Primary Purpose:General lawn feeding
- Additional Feature:Improves drought resistance
- Additional Feature:Easy to spread
- Additional Feature:Standardized pellet size
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Scotts SummerGuard Insect Control
Florida summers are brutal, and not just because of the temperature. This product is a dual-threat solution that feeds your lawn while simultaneously battling common turf-destroying insects that thrive in the heat.
It is a smart, two-in-one approach for homeowners who want to save time. Be sure to check your lawn for active pests before applying, as this is most effective when you catch those little troublemakers early in the season.
- Brand Name:Scotts
- Formula Type:Granular
- Total Weight:13.35 lbs
- Coverage Area:5000 square feet
- Primary Purpose:Fertilizer and insect killer
- Additional Feature:Targets common turf pests
- Additional Feature:Feeds during heat stress
- Additional Feature:Protects root systems
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Scotts Liquid Green Max
Sometimes your lawn just looks a bit yellow or pale. This iron-rich supplement works like a shot of adrenaline for your grass, turning it a deep, vibrant green in a very short amount of time.
It works on all grass types, so you can use it on your St. Augustine and your neighbor's Zoysia alike. Because it is a liquid, it is incredibly easy to use as a quick fix before a party or when you just want your home to look its best.
- Brand Name:Scotts
- Formula Type:Liquid
- Total Weight:32 ounces
- Primary Purpose:Iron supplementation
- Additional Feature:2-in-1 formula
- Additional Feature:Easy hose attachment
- Additional Feature:Works on all grasses
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Scotts Turf Builder Weed & Feed
If your lawn is being overrun by clover and dandelions, you need something that can take control of the situation. This granular fertilizer performs a double duty by feeding the grass while clearing out common broadleaf intruders.
It is best to apply this when the weeds are small and actively growing, as that is when the systemic action works most effectively. It is a staple for those who prefer a clean, uniform look for their property.
- Brand Name:Scotts
- Formula Type:Granular
- Total Weight:14.29 lbs
- Coverage Area:5000 square feet
- Primary Purpose:Weed control and feeding
- Additional Feature:Targets dandelion and clover
- Additional Feature:Promotes thick growth
- Additional Feature:Convenient timing
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Fertilome St. Augustine Weed & Feed
This is the product you choose when you need a heavy duty solution that works as both a pre-emergent and post-emergent weed killer. It is formulated specifically for St. Augustine grass, so it clears out weeds without causing harm to your desired turf.
The granular application is highly effective at staying in the soil to prevent future weeds from taking root. Use this if you are serious about maintaining a weed-free lawn and want a product that carries a bit more punch.
- Brand Name:Fertilome
- Formula Type:Granular
- Total Weight:25.6 lbs
- Primary Purpose:Broad-spectrum weed control
- Key Ingredient:Atrazine
- Additional Feature:Also for Centipede and Zoysia
- Additional Feature:15-0-4 NPK ratio
- Additional Feature:Long lasting control
Frequently Asked Questions
How often should I fertilize my St. Augustine lawn?
You should aim to feed your grass four times per year during the active growing season. Start in early spring once the threat of frost has passed, and finish up by early autumn to avoid encouraging growth before winter sets in.
Can I fertilize while it is raining?
It is actually better to apply fertilizer when the forecast shows light rain is coming. The water helps wash the granules off the blades and into the soil where the roots can absorb the nutrients. Just avoid applying it during a downpour, as the water will simply carry your expensive fertilizer into the street drain.
Will this fertilizer kill my weeds?
Most standard fertilizers do not contain herbicides, meaning they will feed your weeds just as effectively as your grass. If you have a weed problem, look for a "weed and feed" product, but be aware that these can sometimes stress the grass if applied when temperatures are above 85 degrees.
Why is my grass turning yellow after fertilizing?
Yellowing often happens if you apply too much nitrogen too quickly, which burns the roots, or if you have a pH imbalance. You might also be dealing with a lack of iron or a simple iron lockout caused by high soil alkalinity. Check your soil pH levels before assuming your grass is just hungry for more nitrogen.
Is it safe for my pets to walk on the lawn?
You should always keep pets off the lawn until the fertilizer has been thoroughly watered in and the grass blades are completely dry. Check the specific bag instructions for the exact waiting period, which usually lasts about 24 hours. This simple precaution prevents your furry friends from tracking chemicals back into your house.
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