The spring air carries that distinct scent of damp earth and awakening roots, but your St. Augustine lawn often looks a bit sleepy after a long winter. It needs a reliable jumpstart to regain that thick, lush carpet you desire.
Selecting the Best Spring Fertilizers for St Augustine Grass is the primary step in ensuring your turf stays vibrant and healthy all season. I have put together a list of the most effective options to help you choose the right path for your lawn.
Key Takeaways
- Look for fertilizers that include a pre-emergent herbicide like Atrazine if you want to tackle weeds before they get a foothold in your soil.
- Pay close attention to the NPK ratio because St. Augustine grass thrives when it receives high nitrogen for leaf growth and consistent iron for that deep green pigment.
- Decide between granular and liquid applications based on whether you prefer the convenience of a spreader or the fast absorption of a spray.
- Check the square footage coverage listed on the bag to make sure you have enough product to treat your entire property in one pass.
- Choose a slow-release formula if you want to feed your lawn steadily over several weeks instead of dealing with a sudden, short-lived growth spurt.
| All In One Solution |  |
Sunniland St. Augustine Weed and Feed | Dual action formula | Specifically for St. Augustine | Covers 5,000 square feet | View on Amazon | Read Review |
| Balanced Liquid Nutrition |  |
Simple Lawn Solutions 16-4-8 Liquid Fertilizer | Rapid nutrient uptake | Versatile for any grass | Easy spray application | View on Amazon | Read Review |
| Rapid Greening Agent |  |
St. Augustine High Nitrogen Liquid Food | Promotes rich green color | Supports healthy root growth | High nitrogen content | View on Amazon | Read Review |
| Potent Weed Suppressant |  |
Fertilome St. Augustine Weed and Feed | Contains effective Atrazine | Dual weed control | Safe for warm-season grass | View on Amazon | Read Review |
| Environmentally Conscious Choice |  |
Sunniland Phosphorus Free Lawn Fertilizer | Phosphorus free | Slow release nitrogen | Large 2 pack size | View on Amazon | Read Review |
| Reliable General Maintenance |  |
Scotts Turf Builder Lawn Food | Widely compatible formula | Builds strong roots | Simple application process | View on Amazon | Read Review |
| Dual Action Defense |  |
Scotts SummerGuard with Insect Control | Fertilizer plus insecticide | Prevents summer lawn damage | Easy one step application | View on Amazon | Read Review |
| Iron Rich Supplement |  |
Scotts Liquid Green Max Food | High iron content | Rapid color improvement | Easy spray bottle | View on Amazon | Read Review |
| Deep Green Specialist |  |
Fertilome High Iron Lawn Fertilizer | High iron formula | Slow release nitrogen | Southern grass optimized | View on Amazon | Read Review |
| Classic Weed Control |  |
Scotts Turf Builder Weed and Feed | Kills dandelions and clover | Feeds and weeds together | Familiar brand reliability | View on Amazon | Read Review |
More Details on Our Top Picks
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Sunniland St. Augustine Weed and Feed
If you want to simplify your spring chores, this bag is a reliable workhorse. It handles the double duty of feeding your grass while simultaneously suppressing common lawn weeds.
St. Augustine is famously sensitive, so using a product specifically tuned for its needs is like wearing a custom-tailored suit. Just be aware that because it contains weed-control agents, you should avoid applying it near ornamental plants or sensitive garden beds.
- Brand:Sunniland
- Type:Granular
- Coverage:5,000 sq ft
- Key Benefit:Weed and feed
- Additional Feature:Targets broadleaf weeds
- Additional Feature:Promotes dense turf
- Additional Feature:Easy spreader application
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Simple Lawn Solutions 16-4-8 Liquid Fertilizer
Liquid feeding is a fantastic way to give your lawn a quick energy boost. This balanced 16-4-8 ratio provides a steady supply of nitrogen, phosphorus, and potassium that grass craves as temperatures rise.
You will appreciate how quickly the soil absorbs these nutrients compared to slow-acting pellets. It is an excellent choice for spot-treating areas that look thin or pale, though you will need to reapply more frequently than you would with granular options.
- Brand:Simple Lawn Solutions
- Type:Liquid
- Formula:16-4-8
- Weight:32 Ounce
- Key Benefit:Balanced growth
- Additional Feature:Concentrated formula
- Additional Feature:Simple hose end sprayer
- Additional Feature:Fast acting results
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St. Augustine High Nitrogen Liquid Food
Sometimes your lawn just needs a visual pick-me-up after the winter chill. This liquid concentrate focuses on high nitrogen to drive deep green color and encourage those vital new runners to fill in bare patches.
Because it is a liquid, it is perfect for targeted growth in high-traffic spots. Just keep in mind that the small 8-ounce size is meant for smaller patches or maintenance rather than covering an entire large suburban lot.
- Brand:Unbranded/Generic
- Type:Liquid
- Weight:8 oz
- Key Benefit:Thicker growth
- Additional Feature:Easy mix application
- Additional Feature:Fast nutrient delivery
- Additional Feature:Encourages new runners
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Fertilome St. Augustine Weed and Feed
When weeds are actively threatening to take over your yard, you need something with Atrazine in the mix. This granule acts as both a pre-emergent to stop seeds and a post-emergent to kill what is already standing.
It is a specialized tool that keeps your St. Augustine turf clear of competition. Be sure to check your local regulations on Atrazine use, as some areas have strict rules about how much you can apply per year.
- Brand:Fertilome
- Type:Granular
- Formula:15-0-4
- Weight:12.8 lbs
- Key Benefit:Weed control
- Additional Feature:Pre and post-emergent
- Additional Feature:Granular delivery system
- Additional Feature:Zoysia and centipede safe
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Sunniland Phosphorus Free Lawn Fertilizer
Many regions have regulations against phosphorus runoff, making this phosphorus-free blend a smart, responsible pick. It relies on a slow-release nitrogen formula to feed your lawn steadily without causing the explosive, unsustainable growth that leads to more mowing.
This is a great option for long-term maintenance throughout the spring and summer months. Since it does not contain weed killers, it is perfectly safe to use around your entire property without worrying about sensitive landscape plants.
- Brand:Sunniland
- Type:Granular
- Formula:20-0-6
- Weight:40 lbs total
- Coverage:10,000 sq ft
- Key Benefit:Slow release feeding
- Additional Feature:Consistent growth pattern
- Additional Feature:Two bag bundle
- Additional Feature:Environmentally friendly
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Scotts Turf Builder Lawn Food
If you are looking for a dependable staple for your garage, this is it. It provides a foundational feeding that helps grass build strong roots and survive the upcoming summer heat waves.
It is simple to spread and works on almost any grass type you might have in your yard. While it does not include weed control, it is an ideal base fertilizer if you prefer to handle weeds separately or if your lawn is already fairly clean.
- Brand:Scotts
- Type:Granular
- Weight:12.5 lbs
- Coverage:5,000 sq ft
- Key Benefit:All purpose feeding
- Additional Feature:Standard pellet size
- Additional Feature:Easy to spread
- Additional Feature:Durable storage bag
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Scotts SummerGuard with Insect Control
Summer is tough on a lawn, between the heat and the creeping insects that chew on roots. This product gives you the standard nutrition of a lawn food plus an added layer of protection against common backyard pests.
It is a clever choice if you notice small brown patches or thinning turf caused by chinch bugs or grubs. Always remember that this is a broad-spectrum approach, so it is best applied when you know pests are becoming an issue.
- Brand:Scotts
- Type:Granular
- Weight:13.35 lbs
- Coverage:5,000 sq ft
- Key Benefit:Pest protection
- Additional Feature:Insecticide included
- Additional Feature:Prevents heat stress
- Additional Feature:Protects root system
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Scotts Liquid Green Max Food
Sometimes your grass is fed but still looks a bit yellow, which is a classic sign of an iron deficiency. This liquid supplement treats that color problem directly without pushing unnecessary growth that you would have to mow.
It provides a vibrant green finish that really makes the lawn pop against your garden beds. Think of this as the final coat of wax on a freshly washed car, as it is designed for aesthetic impact rather than bulk nutrient delivery.
- Brand:Scotts
- Type:Liquid
- Weight:32 oz
- Key Benefit:Deep green color
- Additional Feature:Two in one formula
- Additional Feature:Works on any grass
- Additional Feature:No mixing required
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Fertilome High Iron Lawn Fertilizer
This formula is engineered specifically for southern grasses that thrive on a balanced diet with extra iron. The slow-release nitrogen keeps your lawn fed for weeks, preventing the peaks and valleys of growth that occur with cheaper alternatives.
The addition of high iron ensures that your St. Augustine stays a dark, rich color all season long. It is a slightly heavier bag, so you get more coverage per application than some of the lighter specialty fertilizers.
- Brand:Fertilome
- Type:Granular
- Formula:15-0-15
- Weight:16 lbs
- Key Benefit:Color and growth
- Additional Feature:Sustained feeding cycle
- Additional Feature:Professional grade results
- Additional Feature:Reduces yellowing
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Scotts Turf Builder Weed and Feed
If your lawn is currently struggling with a clover or dandelion invasion, this is the standard response for many homeowners. It combines the feeding power of Scotts with a chemical agent designed to kill off common broadleaf weeds.
It is effective but requires you to follow the application instructions exactly to ensure the weed killer adheres to the leaves properly. Like other weed and feed products, you should keep it away from your flowers and shrubs to avoid accidental damage.
- Brand:Scotts
- Type:Granular
- Weight:14.29 lbs
- Coverage:5,000 sq ft
- Key Benefit:Weed removal
- Additional Feature:Triple action focus
- Additional Feature:Common weed killer
- Additional Feature:Standard spread rate
Frequently Asked Questions
When is the absolute best time to apply spring fertilizer?
Wait until the grass has fully greened up and started growing consistently. If you fertilize while the grass is still dormant from winter, you are essentially wasting your money. Most experts suggest waiting until your second or third mowing of the season to ensure the roots are ready to take up nutrients.
Can I use the same fertilizer on my lawn as my neighbor uses on their Bermuda grass?
You should avoid doing this unless the bag explicitly lists St. Augustine as a compatible species. Bermuda grass is much tougher and can handle stronger herbicides that would permanently damage your St. Augustine. Always match the product to your specific turf type to keep it alive.
How much fertilizer should I put down per thousand square feet?
Follow the application rate printed on the bag for your specific spreader setting. A common rule of thumb is to apply one pound of nitrogen per thousand square feet. Over-applying will not make your grass grow faster, but it will likely cause burning and tip damage to the leaves.
Do I need to get a soil test before buying fertilizer?
It is not strictly mandatory, but it is the smartest move you can make. A soil test will tell you exactly what nutrients are missing, which saves you from wasted spending on ingredients your lawn does not need. You might find that your soil pH is too high, meaning you need a sulfur amendment rather than just more fertilizer.
Will spring fertilizer kill the weeds currently in my lawn?
Only if you buy a product specifically labeled as a weed and feed. Even then, most of these products only kill weeds that are already visible, not the seeds waiting to sprout later. For the best results, use a pre-emergent early in the spring to stop weeds before they even start to show their faces.
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