Why does your lawn struggle to keep its deep green hue during the heat of summer? Getting St. Augustine grass to thrive requires a specific nutritional strategy that addresses both soil health and weed control.
Selecting the Best St Augustine Grass Fertilizers depends on your current soil conditions and how much time you want to spend on maintenance. Let us compare the top contenders to help you choose the right formula for a thick, healthy yard.
Key Takeaways
- Check the NPK ratio on the bag to ensure it matches the specific growth phase your lawn needs right now.
- Select granular formulas if you prefer slow-release feeding that lasts through several weeks of weather exposure.
- Prioritize liquid concentrates when you want a rapid color boost or have a smaller area to treat.
- Verify whether the product contains herbicides if your primary goal is removing active weeds alongside feeding.
- Confirm the total square footage coverage listed on the packaging to ensure you purchase the correct amount for your property size.
| Best Overall Performer |  |
LESCO St. Augustine Weed and Feed | Targets weeds effectively | Professional grade results | Large bag size | View on Amazon | Read Review |
| Rapid Green Booster |  |
St. Augustine Liquid Lawn Food | Promotes rapid growth | Easy liquid application | Enhances color quickly | View on Amazon | Read Review |
| Versatile Seasonal Feed |  |
Simple Lawn Solutions Balanced Liquid Fertilizer | Easy hose-end application | Balanced nutrient profile | Works on all grasses | View on Amazon | Read Review |
| Nitrogen Rich Nutrition |  |
Sunniland St. Augustine Granular Fertilizer | Slow-release nitrogen | Phosphorus free | Good coverage area | View on Amazon | Read Review |
| High Iron Specialist |  |
Fertilome Centipede and St. Augustine Fertilizer | Rich in iron | Supports warm-season grasses | Slow-release nitrogen | View on Amazon | Read Review |
| Color Enhancement Expert |  |
Scotts Green Max Lawn Food | Fast color results | Added iron supplement | Easy to use | View on Amazon | Read Review |
| Reliable Maintenance Staple |  |
Scotts Turf Builder Lawn Food | Consistent growth results | Works on all grasses | Trusted formula | View on Amazon | Read Review |
| Heavy Duty Nourishment |  |
SeedRanch High-Nitrogen St. Augustine Fertilizer | Bulk volume size | High nitrogen content | Strong growth support | View on Amazon | Read Review |
| Organic Nutrient Blend |  |
Superior Liquid Lawn Food | Contains organic additives | Improves soil health | Includes hose sprayer | View on Amazon | Read Review |
| Weed Control Powerhouse |  |
Fertilome St. Augustine Weed and Feed | Effective weed control | Safe for St. Augustine | Dual-action formula | View on Amazon | Read Review |
More Details on Our Top Picks
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LESCO St. Augustine Weed and Feed
If you want to clear out invasive growth while feeding your lawn, this is your go-to solution. It uses Penoxsulam to target weeds specifically without harming your St. Augustine turf. Think of it as a surgical strike against unwanted intruders.
You get a heavy-duty 50-pound bag that provides substantial coverage for larger properties. Just be careful with your application timing, as the herbicide component requires specific environmental conditions to work effectively. It is the most reliable choice for a clean, uniform lawn.
- Brand Name:LESCO
- Product Type:Granular Weed and Feed
- Total Weight:50 lbs
- Additional Feature:Contains Penoxsulam for weed control
- Additional Feature:Designed for St. Augustine grass
- Additional Feature:Professional strength formula
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St. Augustine Liquid Lawn Food
This liquid formula is designed for homeowners who prefer quick absorption over slow-release granules. It encourages the development of new runners, which helps fill in thin patches across your yard. It acts like a shot of espresso for a tired lawn.
Because it is a liquid, you can distribute it evenly across your soil for consistent results. However, it requires more frequent application than granular options to maintain its rich green color throughout the season. Use this if your lawn needs a visible aesthetic lift quickly.
- Brand Name:St Augustine Grass Fertilizer
- Product Type:Liquid Fertilizer
- Total Weight:1 Gallon
- Additional Feature:Encourages new grass runners
- Additional Feature:Liquid format for absorption
- Additional Feature:Supports dense growth
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Simple Lawn Solutions Balanced Liquid Fertilizer
This balanced 16-4-8 blend provides a steady nutrient supply for your grass throughout the spring and summer. It is incredibly user-friendly since you can attach it to a garden hose for simple, uniform distribution. It acts as a reliable multi-tool for your landscaping arsenal.
The concentration is strong enough to show results without the risk of burning your grass if applied correctly. Keep in mind that as a concentrated liquid, you will need to reapply it regularly to sustain the growth momentum. It is a fantastic choice for those who want a straightforward, no-fuss feeding schedule.
- Brand Name:Simple Lawn Solutions
- Product Type:Liquid Fertilizer
- Nutrient Ratio:16-4-8
- Total Weight:32 Ounce
- Additional Feature:Spring and summer formula
- Additional Feature:Concentrated liquid spray
- Additional Feature:Compatible with all grass types
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Sunniland St. Augustine Granular Fertilizer
If your soil is already high in phosphorus, this 20-0-6 formula is the perfect specialized choice. The slow-release nitrogen ensures your grass receives a consistent food supply over several weeks rather than a sudden, fleeting surge. It is built to build deep roots rather than just surface-level vanity.
The 20-pound bags are manageable to carry, and the two-pack provides enough volume for a 5,000 square foot area. You will appreciate how well it sustains the health of your turf during the hottest months of the year. Avoid using this if your soil tests show a phosphorus deficiency.
- Brand Name:Sunniland
- Product Type:Granular Fertilizer
- Nutrient Ratio:20-0-6
- Total Weight:40 lbs (2 pack)
- Coverage Area:5,000 sq ft
- Additional Feature:Designed for St. Augustine
- Additional Feature:Sustained release formula
- Additional Feature:Easy to spread granules
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Fertilome Centipede and St. Augustine Fertilizer
This fertilizer leans heavily on iron content to give your lawn that deep, dark green hue that neighbors envy. It is specifically formulated to support the needs of warm-season grasses like St. Augustine and Centipede. It functions like a heavy-duty vitamin supplement for tired soil.
The slow-release nitrogen helps avoid the growth spikes that lead to frequent mowing. Just ensure you sweep the granules off your walkways after application, as the high iron content can cause rust-like staining on concrete. It is an excellent choice for a vibrant, healthy color.
- Brand Name:Fertilome
- Product Type:Granular Fertilizer
- Nutrient Ratio:15-0-15
- Total Weight:16 lbs
- Additional Feature:High iron for deep color
- Additional Feature:Slow-release feeding
- Additional Feature:Optimized for warm-season turf
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Scotts Green Max Lawn Food
Scotts Green Max is famous for its ability to deepen your lawn's color within a few days of application. By combining fertilizer with a powerful iron supplement, it addresses both growth and aesthetic quality in one pass. It is like putting a fresh coat of paint on your backyard.
You will find it effective on all grass types, which is great if you have a mixed lawn. Be aware that the rapid greening effect can mask underlying health issues if you aren't monitoring your soil moisture. It is the best way to get that lush, dark look quickly.
- Brand Name:Scotts
- Product Type:Granular Fertilizer
- Total Weight:16.67 lbs
- Coverage Area:5,000 sq ft
- Additional Feature:Deepens grass color
- Additional Feature:Includes iron supplement
- Additional Feature:Versatile for any grass
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Scotts Turf Builder Lawn Food
When you want a product that just works, reach for this classic Turf Builder. It provides a balanced feeding that encourages stronger roots and thicker growth throughout the growing season. It is the workhorse of lawn care, providing consistent results without any surprises.
Because it works on all grass types, it is a convenient choice for any homeowner. The primary limitation is that it lacks specific weed-killing or specialized iron-heavy additives. It is the safest bet for regular maintenance and routine soil health.
- Brand Name:Scotts
- Product Type:Granular Fertilizer
- Total Weight:12.5 lbs
- Coverage Area:5,000 sq ft
- Additional Feature:Strengthens roots
- Additional Feature:Thickens lawn growth
- Additional Feature:Standard maintenance formula
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SeedRanch High-Nitrogen St. Augustine Fertilizer
If your lawn is large and hungry, this 50-pound bag is a highly economical choice. The 24-2-11 ratio provides a strong, nitrogen-heavy boost to encourage vigorous growth during peak season. It is essentially a bulk banquet for your turf.
The granular texture makes it compatible with most standard broadcast spreaders. You will need to be careful with your application rate to prevent over-fertilization, given its high potency. This is the ideal option for those who manage large plots of St. Augustine.
- Brand Name:SeedRanch
- Product Type:Granular Fertilizer
- Nutrient Ratio:24-2-11
- Total Weight:50 lbs
- Additional Feature:High potency formula
- Additional Feature:Designed for large lawns
- Additional Feature:Stimulates leaf development
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Superior Liquid Lawn Food
This liquid fertilizer stands out because it incorporates humic acid, fish, and seaweed alongside standard nutrients. These organic elements work to improve soil health, which leads to long-term resilience in your grass. It acts like a balanced, whole-food diet for your lawn.
The attached sprayer makes application nearly effortless, even if you are not an experienced gardener. It is an all-season formula, but you may find it works best when supplemented with granular food during high-growth months. If you care about soil biology as much as leaf color, pick this up.
- Brand Name:Simple Lawn Solutions
- Product Type:Liquid Fertilizer
- Nutrient Ratio:15-0-15
- Total Weight:32 Ounce
- Additional Feature:Includes fish and seaweed
- Additional Feature:Contains humic acid
- Additional Feature:All-season formula
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Fertilome St. Augustine Weed and Feed
This product combines a fertilizer base with Atrazine, which is a highly effective pre and post-emergent herbicide. It is specifically built to handle weeds in St. Augustine, Centipede, and Zoysia lawns. It acts as a protective shield against common invaders.
You get a granular formula that is easy to distribute across your yard. Because it contains active weed control chemicals, you must strictly follow the label instructions regarding temperature and water. It is the best choice if you are currently battling an active weed infestation.
- Brand Name:Fertilome
- Product Type:Granular Weed and Feed
- Nutrient Ratio:15-0-4
- Total Weight:25.6 lbs
- Additional Feature:Contains Atrazine
- Additional Feature:Pre-emergent protection
- Additional Feature:Post-emergent weed killing
Frequently Asked Questions
How often should I fertilize my St. Augustine lawn?
You should feed your lawn every 6 to 8 weeks during the peak growing season. Aim for three to four applications starting in late spring and ending by early fall. Following this schedule keeps the nutrients consistent throughout the hot summer months.
Will this fertilizer harm my pets or children?
Most granular fertilizers require a watering-in process before it is safe for pets and children to walk on the lawn. Read the manufacturer label carefully, as some products require the grass to be completely dry before re-entry. If you have concerns, look for organic-based options that carry fewer chemical warnings.
Can I use a standard lawn fertilizer instead of a St. Augustine specific one?
You can, but you must check the nitrogen-to-potassium ratio. St. Augustine grass benefits from higher potassium levels to help it survive heat and humidity. A generic fertilizer often lacks the specific micronutrients, like iron and magnesium, that this particular grass variety demands.
What should I do if I accidentally apply too much fertilizer?
If you notice burned patches or yellowing, irrigate the area immediately to dilute the concentration of salts in the soil. Flushing the lawn with water helps move the excess nitrogen past the root zone. Avoid applying any more product until the grass shows clear signs of recovery.
Should I mow before or after I fertilize?
Always mow your lawn a day or two before applying fertilizer. This ensures the granules reach the soil surface rather than getting trapped on top of tall grass blades. Watering the lawn lightly after application also helps the nutrients reach the roots where they belong.
