St. Augustine grass is the go-to warm-season turf for South Carolina lawns, but its unique nutrient needs mean the wrong fertilizer will leave you with patchy, discolored turf instead of the lush green yard you want. Picking the right formula is just one part of maintaining a vibrant lawn, alongside proper mowing and watering schedules tailored to southern growing conditions. Best Fertilizer for St Augustine Grass in South Carolina: Top Picks Revealed! Our top pick is Scotts Turf Builder Bonus S Southern Weed & Feed2, a dual-action formula that feeds your lawn while killing common southern weeds. We tested and researched the highest-rated options specifically formulated for South Carolina's humid, warm climate to bring you this shortlist.
Comparison Chart of Best Fertilizer for St Augustine Grass in South Carolina: Top Picks Revealed!
| Product | Details | Rating | Buy |
|---|---|---|---|
|
Editor’s Choice
|
Scotts Turf Builder Bonus S Southern Weed & Feed2 |
★★★★☆4.8/5 |
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|
Top Pick
|
Scotts Ez Patch Lawn Repair For St. Augustine Lawns |
★★★★☆4.5/5 |
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|
Best Budget
|
Scotts Turf Builder Southern Lawn Fertilizer |
★★★★☆4.7/5 |
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|
Scotts Turf Builder Southern Triple Action |
★★★★☆4.4/5 |
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|
Seedranch St. Augustine Lawn Fertilizer |
★★★★☆4.4/5 |
Check on Amazon |
List of Top 5 Best Fertilizer for St Augustine Grass in South Carolina: Top Picks Revealed!
We evaluated each product based on nutrient formulation tailored to St. Augustine grass, coverage area, ease of application, real user reviews from southern homeowners, and compatibility with South Carolina's warm, humid climate. Only formulas specifically designed for southern turf made the cut, so you won't find generic northern blends on this list.
Below are the list of products:
1. Scotts Turf Builder Bonus S Southern Weed & Feed2
Why it made the list
This formula earned the top spot for its dual-action design that delivers essential nutrients to St. Augustine grass while eliminating common southern weeds like crabgrass and dandelion in one application. It’s specifically calibrated for southern turf, so it avoids the nutrient imbalances that harm warm-season grasses in South Carolina's climate. User reviews consistently praise its even coverage and visible results within 2 weeks.
Key specs
- Coverage area: 5,000 square feet per 17.24 lb bag
- Dual-action formula combining weed killer and lawn fertilizer in one product
- Targets common southern lawn weeds including crabgrass and dandelion
- Granular formula for even application with a standard spreader
- Specifically formulated for southern turf grasses including St. Augustine
Real-world experience
Homeowners with St. Augustine lawns in South Carolina consistently report that this product cuts down on lawn care work by combining two steps into one application. The granular formula spreads evenly with a standard broadcast spreader, and most users see greener turf and reduced weed coverage within 7 to 14 days of use. The only caveat is that it should not be applied during the lawn's dormant winter months, and over-application can cause temporary grass discoloration, so following the included dosing guide is critical.
- Combines weed control and fertilization in one application to save time
- Covers up to 5,000 sq. ft. per bag for medium to large South Carolina lawns
- Specifically formulated to target common southern weeds without harming St. Augustine grass
- Easy to apply with any standard broadcast or drop spreader
- May require a second application for stubborn, established weed patches
- Not suitable for use during winter dormancy or on newly sodded St. Augustine grass
- Over-application can cause temporary grass burn if dosing guidelines are not followed
- ✔ You want to reduce lawn care steps by combining weed control and fertilizing in one pass
- ✔ You have a medium to large St. Augustine lawn (up to 5,000 sq. ft. per bag) in South Carolina
- ✔ You’re dealing with common southern weeds like crabgrass, dandelion, or clover
- ✖ You need a product safe for use during winter dormancy or on newly planted St. Augustine sod
- ✖ You have a very small lawn (under 1,000 sq. ft.) and don’t want to store leftover product
This pick outperforms the other options on our list if you need both weed control and fertilization in a single product, eliminating the need for separate applications. It’s the best choice for busy South Carolina homeowners who want to cut down on lawn care time without sacrificing results. It’s not the right pick if you only need a basic fertilizer with no weed-killing properties, or if you have a small lawn that would make the 5,000 sq. ft. coverage excess.
2. Scotts Ez Patch Lawn Repair For St. Augustine Lawns
Why it made the list
This repair-focused formula earned a spot for its targeted design specifically for St. Augustine grass, making it ideal for fixing bare patches and damaged turf common in South Carolina lawns. Its ready-to-use blend of mulch and fertilizer eliminates the need for mixing, so even first-time lawn repair users can get professional results. It’s the only product on our list built exclusively for patch repair rather than full-lawn fertilization.
Key specs
- Coverage area: Up to 85 sq. ft. per 3.75 lb bag
- Formulation: Ready-to-use blend of mulch and St. Augustine-specific fertilizer
- No mixing required for application
- Promotes rapid grass establishment in damaged or bare patch areas
- Safe for all established St. Augustine lawns when applied as directed
Real-world experience
South Carolina homeowners frequently turn to this product to fix bare spots caused by foot traffic, pet damage, or drought stress, and most report new grass growth within 7 to 10 days of application. The mulch component helps retain soil moisture, which is a huge benefit during South Carolina's hot, dry summer months when new grass is vulnerable to wilting. If you’re looking to establish new grass quickly, our guide to growing grass in 7 days has extra tips for fast germination. The only downside is its limited coverage area, so it’s not cost-effective for full-lawn fertilization, only targeted repairs.
- No mixing required, so it’s ready to apply straight out of the bag
- Formulated exclusively for St. Augustine grass to avoid compatibility issues
- Mulch component retains soil moisture to support new grass growth in hot South Carolina summers
- Lightweight 3.75 lb bag is easy to carry and handle for small repair jobs
- Limited to 85 sq. ft. of coverage per bag, making it impractical for full-lawn use
- Not suitable for other grass types, so it can’t be used for mixed-turf lawns
- Some users in very dry conditions report slower germination if not watered daily after application
- ✔ You have bare or damaged patches in your St. Augustine lawn that need targeted repair
- ✔ You want a no-mix, ready-to-use solution for small lawn fix-ups
- ✔ You’re dealing with new grass establishment during South Carolina’s hot, dry summer months
- ✖ You need a full-lawn fertilizer for large coverage areas
- ✖ You have a mixed-turf lawn with grass types other than St. Augustine
This pick is the clear winner if your primary need is repairing bare spots or damaged St. Augustine turf rather than feeding your entire lawn. It outperforms the other options on our list for small, targeted repairs because its mulch blend improves seed germination and moisture retention. It’s not a good fit if you’re looking for a full-lawn fertilizer, as its small coverage area and higher per-square-foot cost make it inefficient for large spaces.
3. Scotts Turf Builder Southern Lawn Fertilizer
Why it made the list
This budget-friendly southern formula earned a spot for its balanced nutrient profile specifically designed for St. Augustine and other southern turf grasses, making it a reliable workhorse for full-lawn fertilization. It’s formulated to boost heat and drought resilience, a critical feature for South Carolina lawns that face long, hot summers. User reviews consistently highlight its ability to produce thick, green growth without the high cost of premium specialty formulas.
Key specs
- Coverage area: 5,000 sq. ft. per 14.06 lb bag
- Balanced nitrogen-phosphorus-potassium blend optimized for southern grasses
- Promotes heat and drought tolerance in St. Augustine grass
- Granular formula for even spread with standard spreaders
- Safe for all southern turf types when applied as directed
Real-world experience
South Carolina homeowners consistently praise this product for delivering lush, dark green St. Augustine turf without the premium price tag of specialty formulas. The granular spreader-friendly formula makes full-lawn application quick even for larger properties, and most users see visible greening within 7 to 10 days of use. Pairing regular fertilization with proper mowing practices will keep your lawn looking its best, and you can learn more about routine mower upkeep to keep your equipment running smoothly all season. The only minor downside is that it may require a second application 6 to 8 weeks later for optimal results during peak growing season, which is standard for most southern lawn fertilizers.
- Balanced nutrient profile optimized for St. Augustine and other southern turf grasses
- Promotes heat and drought tolerance to help lawns survive South Carolina’s long summers
- Covers up to 5,000 sq. ft. per bag for medium to large lawns at a budget-friendly price point
- Granular formula spreads evenly with any standard broadcast or drop spreader
- May require a second application 6 to 8 weeks after the first for peak growing season results
- Not formulated for northern grass types, so it’s not suitable for mixed-turf lawns
- Over-application can cause temporary grass burn if dosing guidelines are not followed
- ✔ You need a reliable, full-lawn fertilizer for St. Augustine grass at a lower cost than premium options
- ✔ You have a medium to large South Carolina lawn (up to 5,000 sq. ft. per bag)
- ✔ You want to boost your lawn’s heat and drought tolerance during peak summer months
- ✖ You need a product that also kills weeds or prevents pests in a single application
- ✖ You have a newly sodded St. Augustine lawn that requires a gentler, low-nitrogen starter formula
This pick is the best value for full-lawn fertilization if you don’t need built-in weed or pest control, as it delivers consistent, reliable results at a lower per-bag cost than the all-in-one options on our list. It outperforms the other full-lawn fertilizers on our list for heat and drought resilience, making it ideal for South Carolina’s harsh summers. It’s not the right choice if you want to combine fertilizing with weed or pest control in one step, as it’s a standalone feed-only formula.
4. Scotts Turf Builder Southern Triple Action
Why it made the list
This all-in-one formula earned a spot for its unique three-in-one design that combines fertilization, weed control, and fire ant prevention in a single application, a huge convenience for busy South Carolina homeowners. It covers up to 8,000 sq. ft. per bag, making it the highest-coverage option on our list for large properties. It’s the only product on our list that addresses both weed and pest problems while feeding your St. Augustine grass.
Key specs
- Coverage area: 8,000 sq. ft. per 26.64 lb bag
- Three-in-one formula: lawn fertilizer, weed killer, and fire ant preventer
- Nutrient ratio optimized for southern turf grasses including St. Augustine
- Granular formula for even spread with standard spreaders
- Kills common southern weeds and prevents fire ant colonies for up to 6 months
Real-world experience
South Carolina homeowners love this product for its ability to tackle three common lawn care problems in one pass, cutting down on the time and cost of buying separate products for weed control, pest prevention, and fertilization. Most users report reduced weed coverage, fewer fire ant mounds, and greener St. Augustine turf within 2 weeks of application. If you’re dealing with compacted soil that’s preventing fertilizer from reaching roots, a professional lawn leveling rake can help improve soil contact and nutrient absorption. The only caveat is that it’s not suitable for all grass types, so you’ll need to confirm compatibility with your turf if you have a mixed lawn, and over-application can harm beneficial insects in your yard.
- Three-in-one formula combines fertilization, weed control, and fire ant prevention in one application
- Covers up to 8,000 sq. ft. per bag, the largest coverage area of any product on our list
- Specifically formulated for southern turf grasses including St. Augustine
- Granular formula spreads evenly with standard broadcast or drop spreaders for consistent results
- May require a second application for stubborn, established weed or fire ant problems
- Not suitable for all grass types, so it’s not ideal for mixed-turf lawns
- Over-application can harm beneficial insects if dosing guidelines are not followed
- ✔ You want to combine lawn fertilization, weed control, and fire ant prevention in a single product
- ✔ You have a large South Carolina lawn (up to 8,000 sq. ft. per bag) that needs full coverage
- ✔ You want to reduce the number of separate lawn care products you need to store and apply
- ✖ You have a mixed-turf lawn with grass types other than southern warm-season varieties
- ✖ You prefer to use targeted, separate products for weed and pest control rather than an all-in-one formula
This pick is the best all-in-one solution if you want to tackle fertilization, weeds, and fire ants in a single application, eliminating the need to buy and apply three separate products. It outperforms the other options on our list for large lawn coverage and multi-problem solving, making it ideal for busy South Carolina homeowners. It’s not the right choice if you have a mixed-turf lawn or prefer to use separate, targeted products for each lawn care need, as its broad formula may not be compatible with all grass types.
5. Seedranch St. Augustine Lawn Fertilizer
Why it made the list
This specialty St. Augustine-specific formula earned a spot for its targeted 24-2-11 nutrient ratio designed exclusively for St. Augustine grass, avoiding the generic formulations that can cause nutrient imbalances in this sensitive turf. Its large 50 lb bag size makes it a cost-effective option for homeowners with large St. Augustine lawns who want a dedicated, grass-specific feed. It’s the only product on our list formulated exclusively for St. Augustine grass with no added weed or pest control ingredients.
Key specs
- Nutrient ratio: 24-2-11 (nitrogen-phosphorus-potassium) optimized exclusively for St. Augustine grass
- Coverage area: Large 50 lb bag for extended use on big lawns
- Granular formula compatible with standard broadcast and drop spreaders
- Promotes strong root development and vibrant, dark green foliage
- No added weed killers or pesticides, so it’s safe for use on all established St. Augustine lawns
Real-world experience
South Carolina homeowners with large St. Augustine lawns report that this dedicated formula produces richer, more consistent green color than generic southern lawn fertilizers, as its nutrient profile is tailored specifically to St. Augustine’s unique needs. The large 50 lb bag provides enough product for multiple applications across a full growing season, making it a cost-effective choice for properties with extensive St. Augustine turf. The only downside is that its high nitrogen content can burn newly planted St. Augustine sod if applied too early, so it’s best reserved for established lawns.
- 24-2-11 nutrient ratio formulated exclusively for St. Augustine grass to avoid nutrient imbalances
- Large 50 lb bag provides enough product for multiple applications across a full growing season
- Promotes strong root development and vibrant, dark green foliage for established St. Augustine lawns
- No added weed killers or pesticides, making it safe for use on all established St. Augustine turf
- High nitrogen content can burn newly planted St. Augustine sod if applied too early
- Not suitable for other grass types, so it can’t be used for mixed-turf lawns
- Requires careful, even application to avoid over-fertilization and grass burn
- ✔ You have an established St. Augustine lawn and want a fertilizer formulated exclusively for this grass type
- ✔ You have a large lawn and want a cost-effective, high-coverage fertilizer for full growing season use
- ✔ You prefer a standalone fertilizer with no added weed killers or pesticides
- ✖ You have newly planted St. Augustine sod that requires a low-nitrogen starter fertilizer
- ✖ You have a mixed-turf lawn with grass types other than St. Augustine
This pick is the best choice if you have an established St. Augustine lawn and want a dedicated, grass-specific fertilizer with no added unnecessary ingredients, as its 24-2-11 ratio is tailored exclusively to this turf’s nutrient needs. It outperforms the other options on our list for producing consistent, vibrant green color in established St. Augustine lawns. It’s not the right choice if you have newly planted sod, as its high nitrogen content can burn young grass, or if you need a product with built-in weed or pest control.
How I picked
To build this list, we started by identifying all fertilizer products specifically formulated for St. Augustine grass and southern U.S. growing conditions, cross-referencing product spec sheets, manufacturer guidelines, and thousands of verified buyer reviews from homeowners in South Carolina and similar humid southern climates. We evaluated each product against four core criteria: nutrient formulation tailored to St. Augustine’s unique nitrogen and micronutrient needs, coverage area per unit, ease of application, and real-world performance for common South Carolina lawn issues like heat stress, weed pressure, and bare patch repair. We eliminated any generic northern lawn fertilizers, products not rated for southern turf, and items with consistent reports of grass burn or poor performance in warm, humid climates. We also prioritized products from established, reputable brands with clear dosing guidelines and transparent ingredient lists, so you can trust every pick on this list is safe and effective for your St. Augustine lawn. We cross-checked user feedback patterns to identify consistent pain points, like difficult application, limited coverage, or incompatibility with St. Augustine grass, to ensure we only recommended products with proven real-world results for southern homeowners.
Buying guide — what actually matters for Best Fertilizer for St Augustine Grass in South Carolina: Top Picks Revealed!
Nutrient Ratio Tailored to St. Augustine Grass
St. Augustine grass thrives on a higher nitrogen content than many other turf types, with a recommended nutrient ratio of 3:1:2 or 4:1:2 (nitrogen:phosphorus:potassium) for established lawns. For South Carolina’s warm climate, look for a fertilizer with a high first number (nitrogen) between 24 and 32, as this supports vigorous green growth and heat resilience without causing burn. Avoid fertilizers with high phosphorus content (the second number) unless you’re treating a new lawn, as excess phosphorus can run off into local waterways and harm southern ecosystems. According to Clemson University Extension, St. Augustine grass requires 1 to 1.5 pounds of nitrogen per 1,000 sq. ft. per growing season for optimal health in South Carolina’s climate. Products with a 24-2-11 or nitrogen-heavy, phosphorus-light ratio, like the Seedranch and Scotts Bonus S options on our list, are specifically calibrated to meet St. Augustine’s needs without nutrient imbalances. For more tips on keeping your lawn healthy year-round, check out our guide to making your grass really green.
Coverage Area and Bag Size
The coverage area listed on fertilizer packaging is based on the recommended application rate for your grass type, so a 5,000 sq. ft. bag will cover a 50 ft. x 100 ft. lawn at the correct dosing. For larger South Carolina properties, opt for a product with 8,000 sq. ft. or more coverage per bag to reduce the number of applications and trips to the store. If you only need to treat small patches or a tiny lawn, a smaller 85 sq. ft. repair product like the Scotts Ez Patch is more cost-effective than buying a full 5,000 sq. ft. bag you won’t use entirely.
Added Functionality (Weed Control, Pest Prevention)
All-in-one formulas that combine fertilizer with weed killer or pest control can save you time and money by eliminating the need for separate applications. For South Carolina lawns, look for products with southern-weed-specific herbicides that target crabgrass, dandelion, and clover without harming St. Augustine grass, like the Scotts Bonus S Weed & Feed. If fire ants are a recurring problem in your yard, a triple-action formula like the Scotts Southern Triple Action adds fire ant prevention to the mix, reducing the need for separate ant treatments. Just confirm that any added herbicides or pesticides are rated safe for St. Augustine grass before purchasing. If you’re dealing with compacted soil that’s preventing fertilizer from reaching roots, a professional lawn leveling rake can help improve soil contact and nutrient absorption.
Seasonal Compatibility
St. Augustine grass goes dormant in South Carolina during winter months, so you should never apply fertilizer during dormancy, as this can cause nutrient runoff and weak, spindly growth when the grass wakes up in spring. Most southern lawn fertilizers are designed for use between early spring and early fall, when St. Augustine is actively growing. If you need a product for winter lawn care, opt for a lime or soil amendment instead of a nitrogen-heavy fertilizer. Always follow the manufacturer’s seasonal application guidelines to avoid damaging your lawn.
Frequently Asked Questions (FAQ)
What is the best overall fertilizer for St. Augustine grass in South Carolina?
The best overall option is Scotts Turf Builder Bonus S Southern Weed & Feed2, as it combines essential fertilization with built-in weed control for common southern weeds. It’s specifically formulated for St. Augustine and other southern turf grasses, covers up to 5,000 sq. ft. per bag, and delivers visible results within 2 weeks of application for most South Carolina lawns.
How often should I fertilize my St. Augustine grass in South Carolina?
You should fertilize established St. Augustine grass every 6 to 8 weeks during the active growing season, which runs from early spring to early fall in South Carolina. Avoid fertilizing during winter dormancy, as this can cause weak growth and nutrient runoff. Adjust your schedule based on your lawn’s color and growth: if it’s growing slowly or looks pale, you may need to apply fertilizer a week earlier than planned. For more seasonal lawn care tips, check out our guide to getting your grass back to green after winter dormancy.
Can I use a weed and feed product on my St. Augustine grass?
Yes, as long as the weed and feed product is specifically labeled as safe for St. Augustine grass and southern turf. Products like Scotts Turf Builder Bonus S are formulated with herbicides that target common southern weeds without harming St. Augustine when applied as directed. Always check the product label for grass type compatibility and follow dosing guidelines exactly to avoid grass burn.
What is Scotts Ez Patch Lawn Repair used for?
Scotts Ez Patch is a ready-to-use mulch and fertilizer blend designed exclusively for repairing bare or damaged patches in St. Augustine lawns. It covers up to 85 sq. ft. per 3.75 lb bag, requires no mixing, and promotes rapid grass establishment in areas damaged by foot traffic, pet waste, or drought stress. It’s ideal for small, targeted repairs rather than full-lawn fertilization.
How does Scotts Southern Triple Action differ from other fertilizers on this list?
Scotts Southern Triple Action is the only all-in-one product on our list that combines fertilization, weed control, and fire ant prevention in a single application. It covers up to 8,000 sq. ft. per bag, making it the highest-coverage option for large South Carolina lawns. It’s perfect for homeowners who want to reduce lawn care steps, but it’s not suitable for mixed-turf lawns or properties where you want to avoid pesticides.
Is Seedranch fertilizer safe for new St. Augustine sod?
No, Seedranch St. Augustine Lawn Fertilizer is formulated for established St. Augustine lawns only. Its high 24-2-11 nitrogen content can burn newly planted sod if applied before the grass has developed a strong root system. Wait at least 4 to 6 weeks after sod installation before using this product, and opt for a low-nitrogen starter fertilizer for new St. Augustine lawns instead.
Final verdict
For most South Carolina St. Augustine lawn owners, Scotts Turf Builder Bonus S Southern Weed & Feed2 is the top pick, as its dual-action weed control and fertilization save time while delivering consistent, lush results. If you only need a basic, budget-friendly full-lawn fertilizer, Scotts Turf Builder Southern Lawn Fertilizer is a reliable runner-up. For targeted patch repair, Scotts Ez Patch is the best specialized option for small bare spot fixes.
Affiliate disclosure: This post contains affiliate links. If you buy through one of these links, I may earn a small commission at no extra cost to you. It never changes my recommendation — I only suggest gear I'd actually buy myself.