The heavy scent of damp soil hangs in the air as you survey thin, pale patches marring an otherwise uniform turf. Your St. Augustine needs more than just water to regain its thick, carpeted texture.
Applying the right liquid nutrients acts like a fast-acting invigorating tonic for stressed blades. Understanding the Best Liquid Fertilizers for St Augustine Grass will help you foster a vibrant lawn that thrives through the sweltering heat of summer.
Key Takeaways
- Look for a high nitrogen percentage in the NPK ratio if your primary goal is rapid greening and aggressive leaf growth.
- Prioritize formulas containing chelated iron to correct yellowing symptoms without needing to alter your soil pH significantly.
- Select products with humic acid or seaweed extract if you want to improve long-term root health and stress resistance.
- Ensure the concentration matches your available equipment, as some sprayers require specific dilution ratios to prevent leaf burn.
- Check the coverage area per gallon to determine if you need a concentrated bulk size for large suburban lots.
| Best Spot Repair |  |
Scotts EZ Patch Lawn Repair | Repairs bare spots quickly | Includes moisture-retaining mulch | Easy to apply manually | View on Amazon | Read Review |
| Ideal Starter Formula |  |
St Augustine Grass Liquid Food | Promotes dense growth | Enhances green color | Supports healthy root systems | View on Amazon | Read Review |
| Balanced Seasonal Feed |  |
Simple Lawn Solutions 16-4-8 Fertilizer | Balanced nutrient profile | Easy spray application | Works on all grasses | View on Amazon | Read Review |
| Best Large Coverage |  |
Simple Lawn Solutions 16-4-8 Bulk | Bulk volume for large lawns | Includes organic seaweed | Balanced NPK ratio | View on Amazon | Read Review |
| Iron-Rich Color Booster |  |
Scotts Liquid Green Max Food | Rapid greening effect | Dual-action formula | Easy to spray | View on Amazon | Read Review |
| Maximum Growth Booster |  |
Simple Lawn Solutions 28-0-0 Nitrogen | High nitrogen concentration | Quick and slow release | Includes attached sprayer | View on Amazon | Read Review |
| All Season Specialist |  |
Superior 15-0-15 Liquid Fertilizer | Balanced nitrogen and potassium | Contains beneficial soil additives | Good for all seasons | View on Amazon | Read Review |
| Dark Green Specialist |  |
Simple Lawn Solutions Liquid Iron | Produces darker green color | Chelated for easy absorption | Highly versatile use | View on Amazon | Read Review |
| High Nitrogen Colorant |  |
Scotts Liquid Green Max 29-0-0 | Strong nitrogen boost | Added iron for color | Easy to use | View on Amazon | Read Review |
| Best Comprehensive Blend |  |
PetraMax Neighbor’s Envy Fertilizer | Seven in one blend | Covers large area | Pet-safe formula | View on Amazon | Read Review |
More Details on Our Top Picks
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Scotts EZ Patch Lawn Repair
When your St. Augustine lawn develops thin or bare patches, you need a solution that acts like a healing bandage for your soil. This mixture combines mulch and fertilizer to keep the area moist while providing the nutrients necessary for rapid grass recovery. It is ideal for small, localized damage rather than feeding the entire backyard.
Keep in mind that this is a specialized repair tool rather than a general-purpose lawn food. Because it contains mulch to retain water, it works best when you keep the patch consistently damp until new growth takes hold.
- Brand:Scotts
- Product Type:Patch repair mix
- Volume Capacity:3.75 lb
- Additional Feature:Covers up to 170 square feet
- Additional Feature:Integrated mulch for moisture
- Additional Feature:Designed for specific lawn damage
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St Augustine Grass Liquid Food
If you want to see your St. Augustine grass spread through new runners and gain a deep, healthy color, this liquid feed is a solid choice. The high nitrogen content acts as a growth catalyst, pushing your grass to thicken up quickly during the active season. It arrives in an 8-ounce size, making it perfect for those with smaller lawn sections or container gardens.
Because this is a concentrated formula, you must mix it carefully with water before application. It delivers nutrients straight to the roots for faster uptake compared to traditional granules.
- Brand:St Augustine Grass
- Product Type:Liquid lawn food
- Volume Capacity:8 oz
- Primary Nutrient Ratio:High nitrogen
- Additional Feature:Easy mix and feed
- Additional Feature:Fast nutrient delivery
- Additional Feature:Encourages new runner growth
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Simple Lawn Solutions 16-4-8 Fertilizer
A balanced 16-4-8 NPK ratio provides a steady diet for your lawn, ensuring it receives consistent nitrogen, phosphorus, and potassium. This spray is a great option for spring and summer maintenance when your grass is working hard to keep up with the heat. It is a versatile workhorse that performs well on any grass type, including the specific needs of St. Augustine.
You will appreciate the simplicity of this liquid spray, which allows you to cover a large area without the heavy lifting of granular spreaders. Just attach the sprayer and walk your lawn to ensure an even coating across the turf.
- Brand:Simple Lawn Solutions
- Product Type:Liquid fertilizer
- Volume Capacity:32 ounce
- Primary Nutrient Ratio:16-4-8
- Additional Feature:Concentrated spring spray
- Additional Feature:Simple to apply
- Additional Feature:Suitable for summer growth
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Simple Lawn Solutions 16-4-8 Bulk
For those managing expansive lawns, this 2.5-gallon jug is the ultimate efficiency tool. By including fish and seaweed kelp, it adds organic elements to the standard 16-4-8 fertilizer, helping your soil health as much as the grass blades themselves. It is the same balanced formula as the smaller version, but scaled up for heavy-duty application.
Using this on a large property saves you from constant trips to the store for refill bottles. The blend of synthetic nutrients and natural additives provides a comprehensive approach to lawn care that keeps St. Augustine grass looking lush.
- Brand:Simple Lawn Solutions
- Product Type:Liquid fertilizer
- Volume Capacity:2.5 Gallons
- Primary Nutrient Ratio:16-4-8
- Key Additives:Fish and seaweed kelp
- Additional Feature:Concentrated formula
- Additional Feature:Great for large properties
- Additional Feature:Sustains seasonal growth
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Scotts Liquid Green Max Food
Sometimes your grass is growing fine but lacks that vibrant emerald hue you desire. This two-in-one product solves that by combining traditional fertilizer with a healthy dose of iron. It acts as a color correction treatment, turning pale or yellowing grass into a deep green in a short amount of time.
Since it is compatible with any grass type, you can use it across your entire landscape without worry. Apply it when you notice the lawn looking a bit tired and you will likely see a noticeable difference within a few days.
- Brand:Scotts
- Product Type:Fertilizer and iron
- Volume Capacity:32 oz
- Additional Feature:Two in one supplement
- Additional Feature:Fast acting liquid
- Additional Feature:Works on all grass
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Simple Lawn Solutions 28-0-0 Nitrogen
When you need to push for aggressive growth, a high-nitrogen formula like this 28-0-0 blend is exactly what you need. It contains both quick and slow-release nitrogen to provide an immediate boost while ensuring your lawn stays fed for weeks. It is essentially a growth engine for your turf during the peak heat of summer.
Be careful not to over-apply this, as its high concentration is designed for efficiency rather than heavy saturation. The attached sprayer makes it very simple to get professional results on a weekend morning.
- Brand:Simple Lawn Solutions
- Product Type:Liquid nitrogen
- Volume Capacity:32 Ounce
- Primary Nutrient Ratio:28-0-0
- Additional Feature:Attached sprayer included
- Additional Feature:Promotes fast greening
- Additional Feature:Ideal for summer growth
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Superior 15-0-15 Liquid Fertilizer
This fertilizer balances nitrogen and potassium to support both lush growth and strong cell walls. The addition of humic acid, fish, and seaweed makes it a sophisticated blend that improves soil structure while feeding the grass. It is an all-season reliable choice that helps St. Augustine grass survive the stress of both hot summers and chilly autumns.
The 15-0-15 ratio is excellent for maintaining a consistent, healthy lawn without forcing too much rapid growth that might become difficult to manage. You will find that the integrated sprayer keeps the application process clean and fast.
- Brand:Simple Lawn Solutions
- Product Type:Liquid fertilizer
- Volume Capacity:32 Ounce
- Primary Nutrient Ratio:15-0-15
- Key Additives:Humic, fish, and seaweed
- Additional Feature:Improves soil health
- Additional Feature:Attached sprayer provided
- Additional Feature:Supports strong grass cells
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Simple Lawn Solutions Liquid Iron
If you want the deepest green possible, an iron supplement is your secret weapon. This product uses chelated micronutrients, which are specifically designed to be easily absorbed by the grass. It functions like a high-intensity color treatment for your lawn, without the excessive growth that comes with high-nitrogen fertilizers.
This is a versatile tool that works just as well on your outdoor garden or indoor plants as it does on your St. Augustine turf. It is a concentrated booster that you can mix into your existing lawn care routine whenever the color starts to fade.
- Brand:Simple Lawn Solutions
- Product Type:Liquid iron
- Volume Capacity:32 Ounce
- Key Additives:Chelated micronutrients
- Additional Feature:Concentrated green booster
- Additional Feature:Safe for garden use
- Additional Feature:Fast acting formula
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Scotts Liquid Green Max 29-0-0
This version of the Green Max formula packs a punch with a 29-0-0 NPK, emphasizing nitrogen for rapid development. It mirrors the dual-action approach of other Scotts products by adding iron to ensure the resulting growth is thick and dark. It is a heavy-hitter for when your lawn has been neglected and needs a quick turnaround.
You can rely on this for any grass type, making it a safe choice even if your lawn is a mix of different species. Because of the high nitrogen content, always follow the label instructions to avoid burning the grass.
- Brand:Scotts
- Product Type:Liquid fertilizer
- Volume Capacity:32 fl. oz.
- Primary Nutrient Ratio:29-0-0
- Additional Feature:Fast greening action
- Additional Feature:Suitable for all lawns
- Additional Feature:Liquid supplement blend
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PetraMax Neighbor’s Envy Fertilizer
This seven-in-one concentrate is the luxury package for your lawn care regimen. It includes nitrogen, iron, humic acid, and sea kelp to provide a full spectrum of care in one bottle. It covers up to 16,000 square feet, which makes it a highly economical choice for larger properties that need professional-grade maintenance.
The formula is designed to be pet-safe, which provides peace of mind if you have a household full of animals. It addresses everything from root health to blade color, saving you the trouble of buying multiple separate products.
- Brand:PetraMax
- Product Type:Liquid concentrate
- Volume Capacity:1 Gallon
- Key Additives:Nitrogen/Iron/Humic/Sea Kelp
- Additional Feature:Deep green results
- Additional Feature:Economical coverage
- Additional Feature:Broad nutrient profile
Frequently Asked Questions
How often should I apply liquid fertilizer to my St. Augustine grass?
You should aim to feed your lawn every six to eight weeks during the active growing season. Starting in late spring and stopping in early fall allows the grass to stay strong without pushing growth right before the first frost.
Can I apply liquid fertilizer when it is really hot outside?
It is best to avoid fertilizing during the hottest part of the day, as the intense sun can cause the liquid to evaporate too quickly or even burn the grass blades. Apply the fertilizer in the early morning or late evening when the temperatures are milder.
Do I need to water the lawn after applying liquid fertilizer?
Unlike granular fertilizer, you do not need to water the grass immediately after a liquid application. In fact, it is often better to wait 24 hours before irrigating the lawn. This allows the foliar absorption process to work, where the grass leaves take in the nutrients directly. If you water too soon, you will wash the product into the soil before the blades have a chance to drink it up.
Will liquid fertilizer kill my weeds?
No, fertilizer is strictly food for your grass and will not kill weeds. In fact, if you fertilize a lawn full of weeds, you might accidentally make the weeds grow faster too. If you have a weed problem, use a selective herbicide first to clear them out. Once the weeds are gone, you can apply your fertilizer to help the St. Augustine grass spread and fill in the bare spots.
Is it possible to over-fertilize my lawn?
Yes, applying too much fertilizer can lead to nitrogen burn, which turns the grass yellow or brown. Always follow the manufacturer's instructions regarding the mixing ratios and application rates. It is always better to apply a little less than the maximum recommended amount. You can always add more later, but you cannot easily remove fertilizer once it has soaked into the soil.
