Best Granular Weed Killer For St Augustine Grass: 7 Options Compared

#1 · Best Overall

1. Fertilome St. Augustine Weed & Feed

• Weight: 25.6 lb
• Form: Granules

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

Why it ranks #1: Specifically designed for St. Augustine, it combines pre- and post-emergent control with 15-0-4 fertilizer and covers 5,000 square feet.

The 15-0-4 fertilizer paired with pre- and post-emergent weed control gives this Fertilome granule a dual role: it feeds turf while addressing weeds. Its stated fit includes St. Augustine, Centipede, and Zoysia lawns, making it a targeted option for homeowners seeking lawn nutrition and weed control together.

The 25.6-pound bag covers 5,000 square feet, giving buyers a defined area for planning an application. Fertilome recommends early-spring use for lawn health and weed defense through the season, while noting that application varies by footage. The fertilizer is specified for St. Augustine, Centipede, and Zoysia; it must not be used on Bermuda or Northern grasses. That grass-type restriction is an important boundary for choosing this product.

Skip it if you have Bermuda or a Northern grass lawn; this product is expressly not for those grass types.

For St. Augustine owners who want granular weed control and feeding in one application, this is a focused match. Its stated coverage is 5,000 square feet, and the grass restriction rules it out for Bermuda and Northern lawns.

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

#2 · Best for Floratam

2. LESCO St. Augustine Weed and Feed

• Weight: 50 lb
• Form: Granules

Best for: Floratam feeding and weed control.

Why it ranks #2: Made specially for St. Augustine and stated safe for Floratam; its 17-0-17 fertilizer covers 13,000 square feet per listed description.

LESCO specifies safety for Floratam, a St. Augustine variety, alongside slow-release feeding for up to eight weeks. Its 17-0-17 granular fertilizer also includes penoxsulam, giving St. Augustine owners a turf-specific weed-and-feed option with a defined application method and coverage.

The 50-pound bag covers 13,000 square feet, useful for planning treatment across a larger lawn. LESCO says to apply the granules when turf is wet, then allow it to dry; the description reports total results in two weeks. Its 30% poly-coated sulfur-coated urea provides slow-release feeding for up to eight weeks, extending the fertilizer schedule. The stated Floratam safety makes this especially relevant to owners of that St. Augustine variety.

Skip it if you prefer to apply granules only to dry turf; Scotts Halts is specified for early-spring use when the lawn is dry.

LESCO suits St. Augustine owners, particularly those with Floratam, who want broad coverage and extended feeding. Its wet-turf application requirement and 50-pound bag are practical considerations for scheduling and handling.

Listed on Amazon as: LESCO 50 lb. St. Augustine Grass Weed and Feed with Penoxsulam

#3 · Best Pre-Emergent

3. Yard Master 0-0-7 Prodiamine

• Form: Granule

Best for: Broad grass-type pre-emergent.

Why it ranks #3: Lists St. Augustine among suitable grass types and contains 0.37% prodiamine for preventing crabgrass and fall poa annua.

Yard Mastery lists St. Augustine among the grass types suitable for this prodiamine pre-emergent, alongside several other warm-season grasses. That stated compatibility makes its crabgrass and fall poa annua prevention relevant to St. Augustine owners seeking a single granular product usable across varied turf types.

The formula contains 0.37% prodiamine and targets crabgrass in spring and poa annua in fall, connecting the active ingredient to two seasonal prevention needs. Its listed coverage is 6,000 square feet at 3 pounds per 1,000 square feet, providing a rate for planning applications. The suitability list includes St. Augustine, Bahiagrass, Centipedegrass, Bermuda, Zoysia, Seashore Paspalum, and Tall Fescue, helpful where those grass types are present.

Skip it if you need control of weeds already growing; Fertilome St. Augustine Weed & Feed lists post-emergent herbicide action.

This is a fit for St. Augustine owners who want seasonal pre-emergent prevention and value its broad stated grass compatibility. Its listed rate helps plan coverage, but buyers needing treatment of established weeds should look elsewhere.

Listed on Amazon as: 0-0-7 Granular Prodiamine Pre-Emergent Herbicide Fertilizer – 18lbs Covers 6,000 sq ft at 3 lbs/1,000 sq ft – Great for preventing crabgrass, POA annua (Annual Bluegrass), and More

#4 · Broad Weed Prevention

4. Andersons Barricade Granular

• Weight: 18 lb
• Form: Granule

Best for: Seasonal weed prevention.

Why it ranks #4: Its 0.48% prodiamine targets grassy and broadleaf weeds, including crabgrass and poa annua, but the supplied facts do not specify St. Augustine compatibility.

Patented Dispersible Granular Technology lets Barricade granules break into micro particles when watered, moving weed control into the soil. This pre-emergent targets grassy and broadleaf weeds, including crabgrass and poa annua, for buyers focused on preventing germination rather than treating weeds already growing.

The 18-pound bag covers up to 5,800 square feet, which helps define the area an application can address. Its 0.48% prodiamine formula is specified for early-spring and fall applications, so timing is central to the workflow. DG Technology disperses granules after watering, carrying control into the soil. Since the product is explicitly preventive and will not eliminate existing weeds, it suits a prevention plan, not a cleanup pass.

Skip it if you need to kill existing weeds; Fertilome St. Augustine Weed & Feed also provides post-emergent control.

Choose Barricade for a seasonal pre-emergent routine where spring or fall timing and watering are manageable. It is a prevention-only choice, so homeowners facing visible weeds should select a product with stated post-emergent control instead.

Listed on Amazon as: The Andersons Barricade Professional-Grade Granular Pre-Emergent Weed Control – Covers up to 5,800 sq ft (18 lb)

#5

5. Hi-Yield Turf & Ornamental Weed Stopper

• Weight: 12 lb
• Form: Granule

Best for: Later crabgrass-prevention timing.

Why it ranks #5: For established lawns and ornamental turf, it treats up to 5,000 square feet and allows application up to four weeks later than other crabgrass preventers.

Hi-Yield can be applied up to four weeks later than other pre-emergent crabgrass products, offering a later timing window for established lawns and ornamental turf. Its granular formula also provides up to four months of crabgrass control, according to the supplied product facts.

The 12-pound bag treats up to 5,000 square feet, helping buyers plan treatment for a defined area. Hi-Yield recommends application within a few days of mowing, and a properly calibrated spreader or another means of uniform distribution supports even placement. The product is intended for established lawns, ornamental turf, and ornamental landscape areas. Its stated later application window and up-to-four-month crabgrass control make timing and coverage central to its use.

Skip it if you need post-emergent treatment for weeds already growing; Fertilome St. Augustine Weed & Feed lists both pre- and post-emergent control.

Hi-Yield suits owners of established turf who need a later crabgrass-prevention window and can apply near mowing with uniform distribution. Its stated uses include lawns and ornamental areas, while its listed control period is up to four months.

Listed on Amazon as: Hi-Yield (33030) Turf & Ornamental Weed & Grass Stopper, 12 lbs

#6

6. Scotts Halts Weed Preventer

• Weight: 9.6 lb
• Form: Granule

Best for: Weather-tolerant crabgrass prevention.

Why it ranks #6: Prevents listed weeds such as crabgrass and poa annua, but its supplied details do not identify St. Augustine as a suitable grass type.

Scotts says rain, snow, or freezing weather after application will not affect performance, a practical feature for homeowners facing changeable conditions. The granules prevent crabgrass and other listed weeds, with spring and fall applications addressing different seasonal prevention needs.

A single spring application is stated to prevent crabgrass all season, while fall use targets winter weeds such as poa annua, henbit, and chickweed. The product also lists foxtail, spurge, barnyardgrass, fall panicum, goosegrass, and oxalis among spring targets. Apply to a dry lawn in early spring. Restrictions matter for lawn planning: do not use on newly seeded grass until after its fourth mowing, and observe the stated waiting periods for sprigged areas and reseeding.

Skip it if you have newly seeded grass that has not reached its fourth mowing; Hi-Yield Turf & Ornamental Weed & Grass Stopper is for established lawns and ornamental turf.

Scotts fits owners of established lawns seeking seasonal crabgrass prevention with stated tolerance to weather after application. Its new-seeding restriction and dry-lawn application requirement are important boundaries when scheduling lawn work.

Listed on Amazon as: Scotts Halts Crabgrass & Grassy Weed Preventer, 10.06 lbs.

#7

7. Fertilome Weed-Out Pro Turf

• Weight: 26 lb
• Form: Granule

Best for: Broadleaf and crabgrass combination.

Why it ranks #7: It controls over 250 broadleaf weeds and prevents crabgrass, but the listed suitable grasses omit St. Augustine and instead name Kentucky bluegrass, Bahia, Bermuda, and fescue.

Fertilome’s triple-action granules kill broadleaf weeds, prevent crabgrass, and feed turf in one application. The formula controls over 250 broadleaf weeds, including clover, dandelion, and oxalis, but its listed grass types do not include St. Augustine, a crucial fit limitation for this roundup.

The 25-0-4 formula combines weed control with lawn feeding, and the 26-pound bag covers up to 10,000 square feet. Fertilome lists Kentucky Bluegrass, Bahia, Bermuda, and Fescue as application options; St. Augustine is not among those supplied grass types. The product also describes prevention of crabgrass and poa annua germination, with single or split applications listed for established lawns in spring, early summer, or fall.

Skip it if you have St. Augustine grass; Fertilome St. Augustine Weed & Feed is specifically listed for that turf type.

This Fertilome option fits owners of the listed Kentucky Bluegrass, Bahia, Bermuda, or Fescue lawns who want broadleaf control, crabgrass prevention, and feeding together. St. Augustine owners should choose a product expressly listed for their grass.

Listed on Amazon as: Fertilome (10928) Weed-Out Pro Turf 25-0-4 Broadleaf + Crabgrass, 26 lbs