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A healthy Augustine lawn needs the right fertilizer mix, correct timing, and consistent care to stay thick and resist weeds in warm-season landscapes. Pick the wrong product or apply at the wrong time and you can encourage disease, excessive thatch, or uneven growth. This guide focuses on fertilizers for Augustine grass and explains which product traits matter in real yard conditions. We shortlisted seven top options that fit common home-lawn situations and evaluated them on nutrient balance, application ease, and turf response. Read on for practical guidance so you can choose a fertilizer that matches your soil, shade, and maintenance plan.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Scotts Turf Builder Southern Lawn Food, 14.06 lb |  |
| Best Quality Built to a higher standard if you want something more solid | LESCO 50 lb. St. Augustine Grass Weed and Feed (Penoxsulam) |  |
| Best Value The sweet spot between price and what you get | Scotts EZ Patch Lawn Repair for St. Augustine Lawns, 3.75 lb |  |
| Best Budget The cheapest option that still gets the job done reliably | TPS Nutrients St. Augustine Liquid Lawn Fertilizer, 8 oz |  |
| Highest Rated A top-rated pick with lots of positive feedback | Ferti-lome Slow Release Nitrogen Lawn Fertilizer 15-0-15 with Iron (2 Pack, 16 lb each) |  |
| Most Popular A crowd favorite that many people choose with confidence | Scotts Turf Builder Lawn Food, 12.5 lb |  |
| Best Seller A high-volume bestseller chosen again and again | Lesco St. Augustine Lawn Fertilizer 24-2-11 (50 lb) |  |
Scotts Turf Builder Southern Lawn Food, 14.06 lb
| Item Form | Granules |
|---|---|
| Application Method | spreader |
| Coverage | 5,000 sq. ft. |
| Mixing Ratio | 32-0-10 |
| Target Species | Southern lawns, Southern grass |
Scotts Turf Builder Southern Lawn Food is a granular fertilizer made specifically for southern warm-season grasses such as Zoysia, St. Augustine, Bermuda, Bahia, and Centipede. It is designed for broadcast or drop spreader application and uses slow-release nitrogen in every granule so you can apply one feeding and expect up to six weeks of greening. Typical use is in the growing season—apply after the first spring mow or in recommended fall windows and follow spreader settings listed on the bag; light watering after application speeds results but is not required. Practical benefits include even coverage from all-in-one particles, deeper root development to help through heat and drought, and a known feeding schedule for repeat applications. Important limitations are that it contains phosphorus so local restrictions may apply and it is not a weed-and-feed product, so broadleaf weeds will not be controlled by this bag. The product is most useful when paired with a proper spreader and timing that matches Zoysia's fall growth window.
Best for: Homeowners who prioritize a reliable, low-risk fertilizer tailored to Zoysia and other southern warm-season lawns and who prefer predictable, infrequent feedings with measured spreader guidance.
Less Ideal for: Gardeners who need a fertilizer that also controls weeds or who must avoid phosphorus due to local restrictions should consider alternative weed-and-feed or phosphorus-free products.
- Formulated for warm-season southern grasses including Zoysia
- Slow-release nitrogen in each granule for up to six weeks of feeding
- All-in-one particles promote even distribution and consistent greening
- Builds deeper roots to help maintain color through heat and drought
- Contains phosphorus which may be restricted by local regulations
- Does not include weed control so separate weed treatment may be needed
Verdict: A dependable, slow-release granular feed designed to strengthen roots and keep Zoysia green with a single application lasting about six weeks.
LESCO 50 lb. St. Augustine Grass Weed and Feed (Penoxsulam)
| Item Form | Granules |
|---|---|
| Coverage | St. Augustine Grass (12,000 – 14,000 sq. ft.) |
| Target Species | St. Augustine Grass |
| Mixing Ratio | 1:0:1 |
This LESCO product is a granular weed-and-feed formulated for St. Augustine turf, packaged in a 50 lb bag to cover roughly 12,000 to 14,000 sq ft. It combines a balanced 17-0-17 fertilizer with 30% poly coated sulfur coated urea for slow release feeding up to eight weeks and includes penoxsulam for post-emergent broadleaf weed control in St. Augustine varieties including Floratam. Typical use is to apply when the turf is wet, let granules dry on the grass, and expect visible improvement within about two weeks. The slow-release nitrogen reduces the need for frequent reapplications and the specified coverage makes it practical for medium to large lawns. Limitations are that the formula and coverage are focused on St. Augustine only, so it is not suited for other turf types, and a single 50 lb bag is bulky to handle for small-yard users. Also, as with any weed-and-feed, timing and correct application rate matter to avoid turf stress or uneven results.
Best for: Homeowners with established St. Augustine lawns who want a combined slow-release fertilizer and weed control solution to reduce application frequency and maintain even feeding over weeks.
Less Ideal for: People with mixed-species lawns, small yards where a large bag is impractical, or those who need a pure fertilizer without herbicide active ingredients.
- Formulated specifically for St. Augustine grass, including Floratam.
- Balanced 17-0-17 fertilizer with 30% poly coated sulfur coated urea for up to 8 weeks slow feeding.
- Includes penoxsulam for post-emergent broadleaf weed control.
- Large 50 lb bag covers approximately 12,000–14,000 sq ft, suitable for medium to large lawns.
- Designed only for St. Augustine turf and may damage or be ineffective on other grass types.
- Large bag can be heavy and awkward for a single user to handle and spread manually.
Verdict: A convenient, slow‑release weed-and-feed tailored to St. Augustine lawns that supplies weeks of feeding while controlling broadleaf weeds.
Scotts EZ Patch Lawn Repair for St. Augustine Lawns, 3.75 lb
| Item Form | Mulch and Fertilizer Mix, Ready-to-use |
|---|---|
| Coverage | 85 sq ft |
| Target Species | St. Augustinegrass |
| Unit Count | 60 Ounce |
Scotts EZ Patch is a ready-to-use mulch and fertilizer blend specifically formulated for St. Augustinegrass to help repair bare spots and establish plugs. You prep the spot by removing dead material and loosening soil, spread an even layer of the mix so no soil shows, then water until the mulch is saturated. The product’s super-absorbent mulch expands and holds moisture to protect newly exposed soil while the controlled-release fertilizer feeds the grass over time, which the brand says can speed visible repair. Because it contains no seed, it is best used with plugs or to cover recently installed sod rather than for overseeding. The small 3.75 lb jug covers up to 85 sq ft, making it convenient for spot repairs but not for large lawns. For homeowners looking for a simple three-step patch method, this is easy to apply and reduces the need for daily watering; users should plan to combine it with proper plug or sod selection and routine turf care for best results.
Best for: Homeowners with St. Augustine lawns who want an easy, low-effort product to repair bare spots or protect newly placed plugs and sod and who value proven product performance.
Less Ideal for: People trying to reseed large areas or establish a whole lawn from seed should choose a seed-containing product or larger coverage solution.
- Formulated specifically for St. Augustinegrass to support faster establishment
- Super-absorbent mulch expands to retain moisture and improve coverage
- Controlled-release fertilizer feeds turf over time to encourage growth
- Ready-to-use mix requires no measuring or mixing and is simple to apply
- Does not contain grass seed so it cannot establish turf on its own
- Small container size is suitable for spot repairs but not large areas
Verdict: A simple, ready-to-use mulch plus controlled-release fertilizer made to protect and speed repair of St. Augustine bare spots when used with plugs or sod.
TPS Nutrients St. Augustine Liquid Lawn Fertilizer, 8 oz
| Item Form | Liquid |
|---|---|
| Application Method | watering can or hose-end sprayer |
| Coverage | Low |
| Target Species | Lawn Grass |
| Liquid Volume | 8 fluid ounces |
This 8 oz liquid fertilizer from TPS Nutrients is formulated specifically for St. Augustine lawns to encourage greener color, denser turf and deeper roots. It is a high-nitrogen, fast-absorbing formula designed to be diluted and applied with a watering can or a hose-end sprayer, so you can spot-treat problem areas or cover small lawns quickly. The concentrated liquid delivers nutrients immediately to foliage and roots for visible improvement in color and new runner growth, and the product claims to help develop stronger roots for heat and wear resistance. Practical benefits include easy mixing, flexible application methods, and quick uptake compared with granular feeds. Limitations are its low stated coverage and small 8 oz size, which means multiple bottles are needed for average or larger yards and dosing must be measured carefully to avoid over-application. This makes it most useful for small lawns, touch-ups, or trialing the formula before scaling up to larger quantities.
Best for: Buyers with small St. Augustine lawns or those looking to spot-treat thin or high-traffic areas who prefer a fast-acting, easy-to-apply liquid feed on a budget-conscious plan.
Less Ideal for: Homeowners with medium to large lawns who need broad coverage or those seeking a multi-application bulk fertilizer solution.
- Formulated specifically for St. Augustine grass to encourage green color and new runners
- Fast-absorbing liquid for quicker nutrient uptake than many granular fertilizers
- Can be applied with a watering can or hose-end sprayer for flexible spot or small-area treatment
- Small 8 oz bottle offers low coverage, requiring multiple purchases for larger lawns
- High nitrogen formula may require careful dosing to avoid burning if overapplied
Verdict: A small, fast-acting liquid feed that’s a practical, low-cost choice for spot-treating and improving color on small St. Augustine lawns.
Ferti-lome Slow Release Nitrogen Lawn Fertilizer 15-0-15 with Iron (2 Pack, 16 lb each)
| N‑P‑K | 15-0-15 |
|---|---|
| Item Form | Granules |
| Target Uses | Lawn Care |
| Included Components | Lawn Fertilizer |
This two‑bag pack of Ferti-lome 15-0-15 delivers slow‑release nitrogen with added iron to maintain color and steady growth on warm and cool season lawns. Each 16 lb bag is intended to cover up to 4,000 sq ft, so the bundle is convenient for larger yards or for having a spare for the next application. Typical use is a spring and fall feeding at the recommended rate, applied with a broadcast or drop spreader; the slow‑release formulation reduces the need for frequent reapplication and helps avoid quick flushes of growth. The inclusion of iron and micronutrients improves leaf color without extra liquid treatments, and compatibility with many grasses makes this usable on Empire Zoysia. Limitations are that the blend has no phosphorus and is focused on nitrogen and potassium balance, so soils needing phosphorus will require a separate product, and precise coverage depends on correct spreader settings and uniform application. For homeowners prioritizing predictable, low‑maintenance feeding and improved lawn color, this pack is a practical choice.
Best for: Homeowners who want a dependable, low‑maintenance fertilizer regimen and need steady feeding and color improvement across a sizable Empire Zoysia lawn.
Less Ideal for: Gardeners whose soil tests show a phosphorus deficiency or who need a specialized nutrient program focused on establishing new turf should consider a different formula.
- Slow‑release nitrogen provides extended feeding and fewer applications
- Contains iron and micronutrients to enhance leaf color
- Two 16 lb bags cover large areas or allow for a follow-up application
- Suitable for a wide range of grass types including warm‑season Zoysia
- No phosphorus in the 15-0-15 formula so it will not correct phosphorus deficiencies
- Effective, even coverage requires correct spreader calibration and application technique
Verdict: Choose this two‑pack slow‑release 15-0-15 fertilizer when you want predictable, low‑frequency feeding and improved color for an established Empire Zoysia lawn.
Scotts Turf Builder Lawn Food, 12.5 lb
| Item Form | Powder |
|---|---|
| Specific Uses For Product | Lawn |
| Coverage | 5,000 sq. ft. |
| Mixing Ratio | 32:0:4 |
Scotts Turf Builder Lawn Food is a general-purpose granular fertilizer formulated for use on any grass type to thicken turf and improve root strength. You spread it with a broadcast or drop spreader (Scotts provides recommended settings) and can apply it to wet or dry lawns in spring, summer, or fall. The formula is pesticide-free and emphasizes building deeper roots so the lawn better absorbs water and nutrients, which helps turf resist stress over the season. One 12.5 lb bag covers about 5,000 sq. ft., making it a simple option for small to medium yards or spot treatments. Practical benefits include clear application guidance, compatibility with common spreaders, and the option to water in for faster greening. Limitations are that this single bag covers a modest area compared with larger homeowner bags and it does not include weed control or insect protection, so you may need additional products for comprehensive lawn care.
Best for: Buyers who want a reliable, easy-to-apply granular fertilizer to strengthen and green a small to medium lawn and prefer products with widespread user approval and clear instructions.
Less Ideal for: Homeowners needing one-step weed or pest control, or those with large properties who want a single bag to cover many thousands of square feet.
- Works on all common grass types so one product fits mixed lawns
- Builds stronger, deeper roots to improve water and nutrient uptake
- Clear spreader settings and can be applied to wet or dry turf for flexibility
- Pesticide-free formula suitable when you only want fertilization
- Covers only about 5,000 sq. ft. per bag, requiring multiple bags for larger yards
- Does not include weed or insect control so additional products may be needed
Verdict: A reliable, easy-to-use granular lawn food that builds stronger roots and is a solid choice for feeding small to medium lawns.
Lesco St. Augustine Lawn Fertilizer 24-2-11 (50 lb)
| Item Form | Granules |
|---|---|
| Specific Uses For Product | Lawn |
| Target Species | St. Augustine lawn grass |
| Coverage | Full |
| Unit Count | 800 Ounce |
Lesco 24-2-11 is a granular lawn fertilizer specifically designed for St. Augustine turf and formulated to promote greening, particularly when applied in cooler conditions. It is typically spread with a broadcast or drop spreader across the lawn in spring or during cool weather to jump-start color and provide steady nutrient supply; the product includes 6% iron to aid rapid greening. The high nitrogen-to-phosphorus-and-potassium ratio favors leaf growth and recovery rather than root-heavy development, making it useful for lawns that need color and top growth after winter dormancy. As a professional-grade 50 lb bag it covers a large area and is convenient for homeowners with medium to large yards. Important limitations are that it is not intended for hot-weather application and its NPK profile is not aimed at root establishment, so it should be used as part of a seasonal program rather than as a one-size-fits-all solution. Follow the label directions for temperature and application rate to avoid overfeeding.
Best for: Homeowners with St. Augustine lawns who want a reliable product to restore green color after winter and prefer a straightforward granular fertilizer to use with a spreader.
Less Ideal for: Gardeners seeking a low-nitrogen or root-building fertilizer program or those needing a product safe for hot-season application should consider alternatives.
- Formulated specifically for St. Augustine grass for targeted results
- Includes 6% iron to speed visible greening in cool conditions
- Granular form works with standard spreaders for even application
- Large 50 lb bag provides coverage suitable for medium to large lawns
- High nitrogen formulation favors top growth over root development
- Not recommended for application during hot weather
Verdict: Choose Lesco 24-2-11 when you need a large-bag, iron‑boosted granular fertilizer to quickly restore green color to St. Augustine lawns during cool-season applications.
Choosing the Right Fertilizer for Augustine Grass: Key Factors to Consider
Nutrient Ratio and Nitrogen Form
The balance between nitrogen, phosphorus, and potassium determines immediate color response and long-term root health. Augustine grass typically benefits from a lawn fertilizer with a moderate to high nitrogen share and lower phosphorus unless a soil test shows deficiency. The form of nitrogen matters greatly. Quick-release urea or ammonium sources produce fast greenup but can spike growth and increase mowing and disease risk if used excessively. Controlled-release or slow-release nitrogen provides steadier growth, reduces burn risk, and spreads feeding over weeks to months.
Understanding label numbers and the mix of soluble versus slow-release nitrogen will help you match a fertilizer to your mowing frequency, irrigation habits, and desire for steady color without surges in top growth.
Timing and Application Rate
Warm-season grasses like Augustine have distinct growing periods and respond best to fertilization when actively growing. Applying fertilizer too early in spring or too late in fall can stress the grass and invite pests or cold injury. Follow local extension guidance for peak growth windows and reduce rates during transitional times. Application rate affects thatch buildup and thatch-related disease; higher nitrogen doses encourage rapid top growth while lower, more frequent feedings maintain density without excessive thatch.
Accurate spreader settings and calibrating your spreader for the material you use are critical. Over-application creates burn and runoff risks, while under-application delivers disappointing results. Always follow label rates per 1,000 square feet and adjust for your soil fertility and lawn goals.
Soil Type and pH Compatibility
Soil texture and pH influence nutrient availability and how fertilizer behaves after application. Sandy soils drain quickly and may require split applications or slow-release formulas to avoid leaching. Clay soils hold nutrients but can cause surface salt buildup if soluble fertilizer is used too often. pH affects phosphorus and micronutrient availability; a soil test will tell you if lime or sulfur is needed to correct pH before investing heavily in phosphorus-containing fertilizers.
Matching fertilizer choice to your soil type reduces waste and improves turf uptake. In many home lawns, correcting pH and improving organic matter delivers better long-term results than increasing fertilizer intensity.
Shade, Stress Tolerance, and Rooting
Augustine grass often grows in shaded or high-traffic areas where root development and stress tolerance are more important than pure top growth. Fertilizers that encourage deep rooting without excessive leaf extension help the turf withstand drought and foot traffic. Low-nitrogen, higher-potassium blends can improve stress tolerance, while nitrogen-heavy blends boost color but may reduce root focus.
Consider the microclimate across your yard and adjust fertilizer choices for shaded patches versus full-sun areas. Split applications and targeted feeding help balance color and resilience across different lawn zones.
Application Practicalities and Equipment
How you apply fertilizer determines how much of the product actually benefits the grass. Granular fertilizers differ in particle size and flowability; fine dusty granules can clog spreaders and distribute unevenly, while oversized granules may not fit some walk-behind spreader hoppers. Liquid feeds and soluble products require different equipment and can offer faster greening but need careful dilution and irrigation.
Think about storage and handling too. Fertilizers that require frequent reapplication add time and cost. Also evaluate label instructions for watering after application and any local restrictions on fertilizer use near water bodies to minimize runoff concerns.
Environmental and Local Regulations
Many regions have rules limiting nitrogen and phosphorus use to protect waterways. Check local ordinances before choosing a high-phosphorus product and prefer slow-release sources where restrictions apply. Environmental timing restrictions may also limit when fertilizer can be applied during wet seasons to reduce runoff.
Being mindful of these rules helps you avoid fines and protects nearby aquatic systems. Best practice includes calibrating rates, using buffer zones near drains, and following irrigation guidance on the product label.
When to Feed Augustine Grass
Augustine grass follows warm-season growth patterns and shows the best response to fertilization during its active growth months. In most climates that means applying the main feedings from late spring through summer when soil temperatures rise and turf is actively producing new leaf tissue.
Avoid heavy applications during dormancy or cool, wet periods because the grass will not use the nutrients and the risk of leaching or disease increases. Split your season's total nitrogen into two or three timed applications rather than applying one large dose to reduce thatch and improve uptake.
- Time feeds to active growth periods for stronger response.
- Use split applications to maintain steady color without pushing excessive top growth.
- Reduce or skip feeding during cool, damp conditions to lower disease risk.
Interpreting Fertilizer Labels and N-P-K
Fertilizer labels list three numbers representing nitrogen, phosphorus, and potassium. For Augustine grass, look for a formula that provides more nitrogen relative to phosphorus and potassium unless a soil test indicates otherwise. Also check the guaranteed analysis for soluble versus slow-release nitrogen to understand how quickly the turf will respond.
Labels also include application rates per 1,000 square feet and spreader settings. Read these carefully and adjust for the spreader and product type you will use.
- Prioritize nitrogen but confirm phosphorus only if soil tests show need.
- Review slow-release percentage to predict how long the feeding will last.
- Calibrate your spreader using the label's suggested settings.
Watering After Application
Most granulated fertilizers benefit from light irrigation after application to wash nutrients into the root zone and reduce surface burn risk. The label will state an appropriate amount of water to move soluble nutrients into the soil without causing runoff.
In drought conditions, delay applications until you can water in the product. For liquid fertilizers applied through irrigation systems, ensure proper dilution and run times to prevent concentrated streaks that can burn turf.
- Light watering helps move nutrients to roots and reduces burn risk.
- Avoid heavy runoff after application; follow label watering guidance.
- Do not fertilize stressed or drought-affected grass without rehydration first.
Using Soil Tests to Guide Decisions
A simple soil test provides the clearest picture of nutrient needs, pH, and organic matter. Test results allow you to pick a fertilizer formula that corrects real deficiencies rather than guessing with general-purpose mixes. Tests are especially helpful when persistent thin patches or color issues do not respond to standard feeding.
Interpret test results in the context of your lawn's conditions. For example, sandy soils often need more frequent, lower-rate feedings while clay soils may require attention to drainage and pH before fertilizer intensity is increased.
- Test every two to three years or when persistent problems appear.
- Use results to match fertilizer analysis and correct pH issues first.
- Adjust application frequency based on soil texture and organic matter.
Managing Thatch and Overgrowth
Augustine lawns can develop thatch when frequent high-nitrogen applications stimulate rapid top growth. Thatch reduces water infiltration and can harbor pests and disease. To manage thatch, favor controlled-release nitrogen and avoid back-to-back heavy feedings.
Core aeration and dethatching performed at the right time can restore root contact with soil and improve the effectiveness of fertilizer applications. Coordinate aeration with your feeding schedule for best results.
- Prefer slow-release nitrogen to limit thatch buildup.
- Aerate in active growth windows to enhance root uptake after feeding.
- Adjust mowing height to reduce stress and thatch accumulation.
How We Chose the Best Fertilizer for Augustine Grass
We evaluated candidate fertilizers using criteria that matter to homeowners growing Augustine grass in warm-season lawns. First, nutrient ratio and nitrogen release type were central because Augustine responds to the timing and form of nitrogen more than any single macro nutrient. Second, application practicality was assessed, including granule uniformity, spreader compatibility, and labeled spread rates for simple, accurate applications. Third, turf health outcomes were considered conceptually, focusing on expected thickness, color response, and disease risk linked to fertilizer strength and release pattern. Fourth, environmental fit received attention: runoff risk, recommended watering after application, and suitability for sandy versus clay soils. We also considered shade tolerance implications since many Augustine lawns have partial shade and need balanced feeding to avoid excessive top growth. Products without clear label guidance for warm-season turf or those recommended only for cool-season grasses were excluded. The final selections prioritize fertilizers that pair appropriate analysis with practical application instructions and soil-fit guidance.
FAQ
How often should I fertilize Augustine grass?
It depends on your soil fertility and the fertilizer type. Many lawns do well with two to three applications during the active season using a mix of slow-release and soluble nitrogen. Split applications reduce thatch and encourage steady growth.
Can I use a high-nitrogen lawn fertilizer on Augustine grass?
High-nitrogen products will green up turf quickly but can cause excessive top growth and thatch if overused. Balance high-nitrogen use with controlled-release forms or reduce frequency to avoid stress and more mowing.
Should I test my soil before choosing a fertilizer?
Yes. A soil test reveals pH and nutrient levels so you can correct deficiencies rather than guessing. It also helps you choose appropriate phosphorus and potassium levels and whether liming or sulfur is needed for pH adjustment.
Is slow-release fertilizer better for shaded Augustine lawns?
Often yes. Slow-release formulas provide steady nutrients that favor root development and reduce surges in leaf growth that shaded lawns struggle to support. Shade areas usually benefit from lighter, more frequent feeding paired with cultural care.
When is it unsafe to fertilize Augustine grass?
Avoid fertilizing during dormancy, during extended wet spells that increase runoff risk, or when the turf is drought stressed. Also follow local seasonal restrictions meant to protect waterways and reduce nutrient loss.
Final Verdict
Choose a fertilizer for Augustine grass by prioritizing nutrient form, timing, and soil compatibility. Controlled-release nitrogen and correct N-P-K balance reduce the risk of thatch and disease while supporting steady color and root development. Use soil tests and adjust application frequency for your soil type and shaded areas. With attention to spreader calibration, watering after application, and local regulations, you can pick a fertilizer strategy that builds a thicker, more resilient Augustine lawn.
