Best Fertilizer For St Augustine Grass: 10 Options Compared

#1 · Best Overall

1. Sunniland St. Augustine Fertilizer

• Weight: 20 lb
• Form: Granules

Best for: St. Augustine slow-release feeding.

Why it ranks #1: Made for St. Augustine, its 20-0-6 formula has 50% slow-release nitrogen and no added phosphorus for steady, grass-specific feeding.

With 50% slow-release nitrogen in a 20-0-6 formula, Sunniland provides St. Augustine lawns with sustained nitrogen feeding plus potassium, without added phosphorus. The granular fertilizer is specifically formulated for this grass, and the two-bag bundle covers 5,000 square feet per bag for homeowners planning a larger feeding supply.

The St. Augustine-specific formula pairs nitrogen for turf growth with potassium to support lawn health, while leaving out added phosphorus. Because half the nitrogen is slow release, feeding is intended to be steadier rather than delivered all at once. Granules suit lawn-wide application, and each bag covers 5,000 square feet; the two-pack gives buyers supplies for up to 10,000 square feet at the stated coverage. It is a focused choice when phosphorus-free nutrition is wanted.

Skip it if you need a liquid application or a formula with phosphorus; Simple Lawn Solutions 16-4-8 is a liquid option with phosphorus.

Choose this for St. Augustine lawns needing granular nitrogen and potassium with slow-release feeding, especially when phosphorus-free fertilizer suits the plan. The two-bag bundle is substantial, so account for its 5,000-square-foot coverage per bag.

Listed on Amazon as: Sunniland St. Augustine Lawn Fertilizer 20-0-6 – Slow Release Nitrogen Granular Lawn Food – Covers 5,000 sq ft per Bag – Phosphorus Free Turf Fertilizer – 20 lb Bags (2 Pack)

#2 · Highest Analysis

2. SeedRanch St. Augustine 24-2-11

• Weight: 50 lb
• Form: Granules

Best for: St. Augustine greening with iron.

Why it ranks #2: This St. Augustine-specific 24-2-11 granular fertilizer includes 6% iron and lists coverage of 12,000 square feet.

A 24-2-11 formula with 6% iron gives SeedRanch St. Augustine Lawn Fertilizer a grass-specific, greening-focused profile. The professional-grade granules provide nutrients for St. Augustine lawns and list coverage of 12,000 square feet, making the 50-pound bag suited to larger lawn-care plans.

The product is explicitly identified for St. Augustine, so its intended turf fit is clear, and its 6% iron is included for greening. Listed coverage of 12,000 square feet helps buyers plan the large 50-pound granular supply across a substantial lawn. The description recommends spring application to jump-start turf greening when temperatures are cool, while the safety information cautions against applying in hot weather. That seasonal boundary matters for warm-climate lawn schedules.

Skip it if you need a smaller listed coverage area or a liquid formula; TPS Nutrients St Augustine Grass Fertilizer is an 8-ounce liquid.

This suits owners of larger St. Augustine lawns who want a granular spring feed with iron and stated coverage of 12,000 square feet. Follow the cool-weather guidance and avoid applying during hot conditions.

Listed on Amazon as: SeedRanch St. Augustine Lawn 24-2-11 Fertilizer – 50 Lbs.

#3 · Weed Control Pick

3. ferti-lome St. Augustine Weed & Feed

• Weight: 25.6 lb
• Form: Granules

Best for: St. Augustine weed-and-feed care.

Why it ranks #3: Its 15-0-4 formula is designed for St. Augustine and combines fertilizer with pre- and post-emergent weed control.

Combining pre- and post-emergent weed control with a 15-0-4 fertilizer, ferti-lome St. Augustine Weed & Feed addresses lawn nutrition and weeds in one granular product. Its listed target grasses include St. Augustine, Centipede, and Zoysia, with an early-spring application window and coverage of 5,000 square feet.

The combined herbicide and fertilizer approach can simplify a spring lawn-care task by pairing weed control with a 15-0-4 nutrient mix. Granules cover 5,000 square feet, giving buyers a defined area for planning treatment, although application varies by footage and the label supplies the instructions. The product is listed for St. Augustine, Centipede, and Zoysia, so grass identification matters; the listing explicitly rules out Bermuda and Northern grasses.

Skip it if you have Bermuda or a Northern grass lawn; Scotts Green Max Lawn Food is listed for any grass type.

Consider it when a St. Augustine lawn needs spring weed control alongside fertilizer in a 5,000-square-foot granular treatment. Identify the turf first: the listing excludes Bermuda and Northern grasses, and directs users to the label for application instructions.

Listed on Amazon as: Fertilome (13917) St. Augustine Weed & Feed 15-0-4, 25.6 lbs

#4 · St. Augustine Liquid

4. TPS Nutrients St. Augustine Liquid

• Form: Liquid

Best for: Liquid St. Augustine lawn feeding.

Why it ranks #4: This liquid lawn food specifically targets St. Augustine, with listed support for deep green color, thicker growth, and root development.

A fast-absorbing liquid formula is the key distinction of TPS Nutrients St. Augustine fertilizer, offering a convenient route to nutrient delivery for lawns where color and growth are priorities. Its stated benefits include richer green appearance and deeper roots that support water and nutrient uptake in warm-climate turf.

The liquid form is intended to absorb nutrients efficiently, which supports the product's stated aim of visible improvements in growth, color, and turf health. Its St. Augustine focus makes it directly relevant to this grass, while the root-support claim connects to improved water and nutrient uptake and durability under heat and wear. At 8 ounces, it is a small-format choice; the supplied details do not give a coverage area or application method.

Skip it if you want a stated coverage area before choosing; Sunniland St. Augustine Lawn Fertilizer lists 5,000 square feet per bag.

This fits St. Augustine owners seeking a liquid feed associated with greener appearance and root support. The supplied listing does not state coverage or application directions, so it is less informative for planning a measured lawn-wide treatment.

Listed on Amazon as: St Augustine Grass Fertilizer, Liquid Lawn Food for Thicker Growth, 8 oz

#5 · Extended Feeding

5. The Andersons PGF Complete 16-4-8

• Weight: 18 lb
• Form: Granules

Best for: Fine-granule extended feeding.

Why it ranks #5: Its 16-4-8 formula is safe for all turf types and provides quick- and slow-release nitrogen for up to eight weeks.

Super-fine particles are the defining feature of The Andersons PGF Complete 16-4-8, with twice the number of particles per square foot for even distribution. Its quick- and slow-release nitrogen supports immediate and extended feeding for up to eight weeks, alongside iron, micronutrients, and Humic DG.

The fine particle size is intended to distribute nutrients evenly across turf, while the 16-4-8 ratio supplies a balanced NPK profile. Quick-release nitrogen feeds sooner and slow-release nitrogen extends feeding for up to eight weeks, giving the granular product a combined feeding window. Iron, micronutrients, and Humic DG round out the listed nutrition. It is stated safe for all turf types and usable during the growing season, though application requires gloves, goggles, and a dust mask.

Skip it if you live in California; Scotts Green Max Lawn Food is a granular alternative listed for any grass type.

This fits St. Augustine owners seeking granular, broadly compatible feeding with fine particles and up to eight weeks of nutrition. It is not for sale in California, and handling calls for protective gear against direct contact.

Listed on Amazon as: The Andersons Professional PGF Complete 16-4-8 Fertilizer with 7% Humic DG 5,000 sq ft

#6

6. Simple Lawn Solutions 16-4-8

• Weight: 2 lb
• Form: Liquid

Best for: Hose-end balanced liquid feeding.

Why it ranks #6: The 16-4-8 liquid fertilizer is listed for all grass types and includes seaweed and fish alongside its macronutrients.

A ready-to-use sprayer makes Simple Lawn Solutions 16-4-8 a hose-end liquid option for feeding lawns without spreading granules. The balanced nitrogen, phosphorus, and potassium formula also contains seaweed and fish, and the product is stated for any grass type, making it compatible with a broad range of turf.

The 16-4-8 blend provides all three listed macronutrients, while the seaweed and fish ingredients add to its liquid lawn-food formulation. Application uses a hose-end sequence: shake the bottle, connect the hose-end sprayer, attach it to a water hose, then spray evenly across the lawn. That workflow avoids a separate granular spreader, but depends on access to a hose and sprayer. Its any-grass-type claim includes St. Augustine suitability in the supplied listing.

Skip it if you need a granular product applied with a spreader; The Andersons PGF Complete is a granular 16-4-8 option.

This suits St. Augustine owners who prefer hose-end liquid application and want a balanced NPK feed with seaweed and fish. Plan around the required hose connection and even spraying workflow rather than granular spreader application.

Listed on Amazon as: Advanced 16-4-8 Balanced NPK – Lawn Food Quality Liquid Fertilizer – Spring & Summer Concentrated Spray – Any Grass Type – Simple Lawn Solutions (32 Ounce)

#7

7. Scotts Green Max Lawn Food

• Weight: 16.7 lb
• Form: Granules

Best for: Fast greening with iron.

Why it ranks #7: This all-grass-type granular food includes 5% iron and lists deep greening in three days; the listing says it is not sold in Florida.

Scotts Green Max pairs lawn food with 5% iron and states that it feeds for deep greening in three days. The 2-in-1 granular formula is listed for any grass type and can be used in spring, summer, or fall, offering St. Augustine owners a broad seasonal option where available.

The fertilizer-plus-iron approach connects feeding with a specific color goal: the product says iron enhances greening, with deep greening in three days. Granules are applied using a Scotts spreader, and the listing says lawns can be re-entered immediately after application. Its any-grass-type claim and spring, summer, or fall use broaden its fit, but the product is expressly not sold in Florida, a significant availability boundary for many St. Augustine buyers.

Skip it if you live in Florida; Sunniland St. Augustine Lawn Fertilizer is specifically formulated for St. Augustine and listed in a two-bag bundle.

This suits buyers outside Florida seeking a broad-season granular feed with iron for faster greening on St. Augustine or other grass types. Its Florida sales restriction is decisive, so check availability before making it part of a lawn plan.

Listed on Amazon as: Scotts Green Max Lawn Food, 16.67 lbs.

#8

8. Pennington Full Season 32-0-5

• Weight: 11.2 lb
• Form: Granules

Best for: Season-long controlled-release feeding.

Why it ranks #8: Its polymer-coated urea releases nitrogen for up to four months, but the listed grass examples do not specifically name St. Augustine.

One application is stated to feed for a season, with polymer-coated urea releasing nitrogen for up to four months. Pennington Full Season adds 5% iron for deep greening and beneficial microorganisms for soil care, making it a low-frequency granular option for buyers seeking extended feeding.

The controlled-release nitrogen links one application with feeding that can continue for up to four months, reducing the need for frequent feeding during that period. Added iron supports the stated deep-greening benefit, while beneficial microorganisms are included to revitalize soil. Apply with a spreader according to package directions. The supplied grass list includes several turf types, but does not name St. Augustine, so buyers should check the product directions for its specific grass guidance.

Skip it if you require an explicitly St. Augustine-labeled fertilizer; Sunniland St. Augustine Lawn Fertilizer names that grass in its title.

This is a fit for buyers prioritizing extended-release feeding, iron, and soil microorganisms in a spreader-applied granular product. Since the supplied grass examples omit St. Augustine, verify its listed directions for your turf before use.

Listed on Amazon as: Pennington Full Season Lawn Fertilizer 4M 32-0-5 RF 3/11.2Lb

#9

9. Simple Lawn Solutions 3-18-18

• Weight: 3 lb
• Form: Liquid

Best for: Root-focused phosphorus and potassium.

Why it ranks #9: This liquid formula emphasizes phosphorus and potassium for root vigor or nutrient deficiencies, but it is not specifically formulated for St. Augustine.

A high-phosphorus, high-potassium 3-18-18 formula sets this Simple Lawn Solutions liquid apart for lawns needing those nutrients or seeking root vigor. The concentrated spray is described for any grass type and summer or fall use, giving St. Augustine owners a targeted liquid option rather than a balanced high-nitrogen feed.

The 3-18-18 ratio emphasizes phosphorus and potassium, and the product is specifically positioned for nutrient deficiencies involving either element or for maintaining lawn health. Its liquid form is intended for easy application, while the description connects the formula to vigorous roots and stronger turf. Any-grass-type wording supports use on St. Augustine, but phosphorus-containing fertilizer may be restricted in some locations; the listing advises checking local laws before application.

Skip it if you need phosphorus-free feeding or live where phosphorus lawn applications are restricted; Sunniland St. Augustine Lawn Fertilizer has no added phosphorus.

Choose this for St. Augustine turf when phosphorus and potassium are the targeted nutrients and a liquid application suits your routine. Check local restrictions first, since the formula contains phosphorus and some states limit its lawn use.

Listed on Amazon as: Ultimate 3-18-18 NPK- Lawn Food Quality Liquid Fertilizer- Easy to Use Concentrated Spray- Any Grass Type- Summer & Fall Nutrients- Simple Lawn Solutions – Turf Hardiness & Root Vigor (32 Ounce)

#10

10. Scotts Turf Builder WinterGuard

• Weight: 8 oz
• Form: Granules

Best for: Fall root preparation.

Why it ranks #10: This fall lawn food is listed for any grass type, but its seasonal root-preparation focus is less targeted than the St. Augustine-specific options.

Fall timing is central to Scotts Turf Builder WinterGuard: it feeds lawns as they recover from summer heat, drought, and activity while building deep roots for the following spring. The granules are listed for any grass type and can be applied to a wet or dry lawn using a Scotts spreader.

This seasonal product links fall feeding with two practical aims: helping turf recover from summer stresses and preparing roots for winter conditions. Its wet-or-dry application flexibility lets a buyer choose lawn conditions at application, while the supplied spreader settings offer guidance for Scotts broadcast/rotary and drop spreaders. It is listed for any grass type, so it can suit St. Augustine, but its specific use window is fall rather than a general-purpose, year-round feeding schedule.

Skip it if you need feeding outside fall; Scotts Green Max Lawn Food is listed for spring, summer, or fall use.

Choose WinterGuard for fall lawn care when the goal is recovery and root preparation ahead of winter. Its any-grass-type listing includes St. Augustine, but the seasonal purpose makes it a poor fit for off-season feeding.

Listed on Amazon as: Scotts Turf Builder WinterGuard Fall Lawn Food, 10 lbs.