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20 Best Pre Emergent For St Augustine Grass (2023 Updated)

Pre-emergent herbicides are usually applied before the targeted weeds germinate, and they work by preventing the weed seeds from growing. Many pre-emergent herbicides will also kill young seedlings, so it’s important to read the label carefully and follow the directions.

20 Best Pre Emergent For St Augustine Grass

Product Image Product Name Features Price

Southern Ag Atrazine St. Augustine Weed Killer, 32oz – 1 Quart

  • 1 Quart

Barricade Pre-Emergent Herbicide 10#bag – Nitrophos Prodiamine

  • Prodiamine .58%.
  • Barricade is applied with a broadcast spreader at a rate of 10 pounds per 5000 square feet.

Scotts WeedEx Prevent with Halts Weed Preventer Granules 10 lb

  • Prevents crabgrass all season long
  • Weather elements will not affect the product performance
  • Stops crabgrass before it starts

Hi-Yield Atrazine Weed Killer (32 oz)

  • This selective weed killer controls Henbit, Clover, Chickweed and more. See label for full list.
  • Intended for use on St.
  • This 32 oz bottle of liquid concentrate weed killer can treat up to 3,720 sq. feet of lawn.

Preen 4.93 lbs. Extended Control Weed Preventer

  • Blocks weeds for up to six months per application, guaranteed
  • Flip-top applicator cap makes it easy to apply
  • Not intended for use on flower seeds, lawns, vegetable gardens, water gardens or other food-producing or edible plants

Prodiamine 65 Wdg Herbicide (generic Barricade) – 5 lbs.

  • Effectively controls Annual Bluegrass and Crabbgrass as well as many other annual grass and broadleaf weeds.
  • Active ingredient rate as low as 1/4 the rate of other pre-emergent herbicides.

Spectracide Weed Stop, For Lawns, For St. Augustine & Centipede Lawns, Concentrate – 32 fl oz

  • Ready-To-Spray
  • Specially Formulated For Use On St.
  • Won T Harm Lawns

16-lb St. Augustine Weed and Feed 15-0-4

  • 16 lb

Southern Ag Surflan A.S. Specialty Herbicide Pre-Emergent Herbicide, 8oz

  • 8 oz

IMAGE By Lilly Miller Casoron – Granules – 8 lb bag

  • Size: 3.6kg.
  • Ready to use.
  • One application for all seasons.

Image Southern Lawn Weed Killer Concentrate, 32 Oz.

  • Kills the toughest weeds down to the root
  • For use on Southern lawns including St
  • Augustine and Centipede

Greenview – Preen Lawn Crabgrass Control 15 lb

  • It also provides post-emergence control of seedling crabgrass for up to 4 weeks after it germinates.
  • Preen Lawn Crabgrass Control should be applied to lawns and ornamental turfgrasses that are well established.

Espoma 25 lb Organic Weed Preventer

  • 25#

Speedzone Southern Broadleaf Herbicide for Turf – 1 Gallon

  • 1 Gal

Preen 10 lbs. Lawn Weed Control

  • 10 lb

Concern 25 lb. Weed Prevention Plus

  • For use in flower gardens vegetable gardens and in landscaping areas
  • Ideal for use under bird feeders
  • Safe for children and pets
Southern Ag Atrazine St. Augustine Weed Killer, 32oz – 1 Quart
  • 1 Quart
Barricade Pre-Emergent Herbicide 10#bag – Nitrophos Prodiamine
  • Prodiamine .58%.
  • Barricade is applied with a broadcast spreader at a rate of 10 pounds per 5000 square feet.
Scotts WeedEx Prevent with Halts Weed Preventer Granules 10 lb
  • Prevents crabgrass all season long
  • Weather elements will not affect the product performance
  • Stops crabgrass before it starts
Hi-Yield Atrazine Weed Killer (32 oz)
  • This selective weed killer controls Henbit, Clover, Chickweed and more. See label for full list.
  • Intended for use on St.
  • This 32 oz bottle of liquid concentrate weed killer can treat up to 3,720 sq. feet of lawn.
Preen 4.93 lbs. Extended Control Weed Preventer
  • Blocks weeds for up to six months per application, guaranteed
  • Flip-top applicator cap makes it easy to apply
  • Not intended for use on flower seeds, lawns, vegetable gardens, water gardens or other food-producing or edible plants
Prodiamine 65 Wdg Herbicide (generic Barricade) – 5 lbs.
  • Effectively controls Annual Bluegrass and Crabbgrass as well as many other annual grass and broadleaf weeds.
  • Active ingredient rate as low as 1/4 the rate of other pre-emergent herbicides.
Spectracide Weed Stop, For Lawns, For St. Augustine & Centipede Lawns, Concentrate – 32 fl oz
  • Ready-To-Spray
  • Specially Formulated For Use On St.
  • Won T Harm Lawns
16-lb St. Augustine Weed and Feed 15-0-4
  • 16 lb
Southern Ag Surflan A.S. Specialty Herbicide Pre-Emergent Herbicide, 8oz
  • 8 oz
IMAGE By Lilly Miller Casoron – Granules – 8 lb bag
  • Size: 3.6kg.
  • Ready to use.
  • One application for all seasons.
Image Southern Lawn Weed Killer Concentrate, 32 Oz.
  • Kills the toughest weeds down to the root
  • For use on Southern lawns including St
  • Augustine and Centipede
Greenview – Preen Lawn Crabgrass Control 15 lb
  • It also provides post-emergence control of seedling crabgrass for up to 4 weeks after it germinates.
  • Preen Lawn Crabgrass Control should be applied to lawns and ornamental turfgrasses that are well established.
Espoma 25 lb Organic Weed Preventer
  • 25#
Speedzone Southern Broadleaf Herbicide for Turf – 1 Gallon
  • 1 Gal
Preen 10 lbs. Lawn Weed Control
  • 10 lb
Concern 25 lb. Weed Prevention Plus
  • For use in flower gardens vegetable gardens and in landscaping areas
  • Ideal for use under bird feeders
  • Safe for children and pets

1. Southern Ag Atrazine St. Augustine Weed Killer, 32oz – 1 Quart

Southern Ag Atrazine St. Augustine Weed Killer, 32oz - 1 Quart

  • 1 Quart

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Product Details

Specifications

Details
Liquid Volume 1 Quarts
Item Form Spray
Active Ingredients Herbicide, Atrazine
Product Dimensions 6 x 3 x 8 inches
Is Discontinued By Manufacturer No

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Fredrik
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2. Barricade Pre-Emergent Herbicide 10#bag – Nitrophos Prodiamine

Barricade Pre-Emergent Herbicide 10#bag - Nitrophos Prodiamine

  • Prodiamine .58%.
  • Barricade is applied with a broadcast spreader at a rate of 10 pounds per 5000 square feet.

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Amazon.com – Seller
Solutions Pest & Lawn

Product Details

Specifications

Details
Restricted Use No
Application Equipment Hand Spreader, Push Spreader
Application Methods Granular Spreading
Chemical Type Herbicide
Formulation Granular

3. Scotts WeedEx Prevent with Halts Weed Preventer Granules 10 lb

Scotts WeedEx Prevent with Halts Weed Preventer Granules 10 lb

  • Prevents crabgrass all season long
  • Weather elements will not affect the product performance
  • Stops crabgrass before it starts
  • Apply in early spring for season-long prevention of crabgrass
  • Use on all lawn and grass types (EXCEPT dichondra or bentgrass)

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Scotts Direct
Esbenshade’s Garden Center
McGuckin Hardware

Product Details

Specifications

Details
Recommended for Poison Oak No
Safer For Pets Yes
Application Method Spreader
Natural No
Recommended for Crabgrass Yes

4. Hi-Yield Atrazine Weed Killer (32 oz)

Hi-Yield Atrazine Weed Killer (32 oz)

  • This selective weed killer controls Henbit, Clover, Chickweed and more. See label for full list.
  • Intended for use on St.
  • This 32 oz bottle of liquid concentrate weed killer can treat up to 3,720 sq. feet of lawn.
  • For best results apply in early spring. Can be applied during both dormant and growing seasons.
  • Application varies by dimension and grass type. See label for application instruction.

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Product Details

Specifications

Details
Product Form RTU Liquid
Container Size 32 oz
Coverage Area 3720 sq ft
Primary Active Ingredient Atrazine and Related Compounds
Application Season Multi Season

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5. Preen 4.93 lbs. Extended Control Weed Preventer

Preen 4.93 lbs. Extended Control Weed Preventer

  • Blocks weeds for up to six months per application, guaranteed
  • Flip-top applicator cap makes it easy to apply
  • Not intended for use on flower seeds, lawns, vegetable gardens, water gardens or other food-producing or edible plants

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Product Details

Specifications

Details
Type of Weed Broadleaf Weeds
Organic No
Product Form Granules
OMRI Certified No
Rain Proof Yes
Product Type Preventer
Pre/Post Emergent Pre Emergent
Primary Active Ingredient Trifluralin-Isoxaben
Targeted Weed Weed
Container Size 4.93 lb
Coverage Area 805 sq ft
Application Season All Season
Extended Control Yes
Brand Name Preen

6. Preen 13 lbs. Garden Weed Preventer

Preen 13 lbs. Garden Weed Preventer

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Product Details

Specifications

Details
Recommended for Poison Ivy No
Safer For Kids No
Odorless No
Primary Usage Weed preventer
Recommended for Tree Stumps No
Recommended for Vines No
Maximum Duration of Effectiveness (Days) 90
Maximum Coverage Area (Sq. Feet) 2080
For Use in Vegetable Gardens Yes
Recommended for Dandelions No
Recommended for Algae No
Application Season All season
Lowe’s Exclusive No
Recommended for Poison Oak No
Safer For Pets No
Natural No
Rain Resistant Yes
Ready to Use Yes
For Use Around Trees Yes
Recommended for Chickweed Yes
Application Method Shaker bottle
Contains Glyphosate No
EPA Registration Number 961-280
Recommended for Moss No
Organic No
OMRI Listed No
For Use in Flower Beds Yes
Recommended for Nutsedge No
Area of Use Garden
Recommended for Crabgrass Yes
Active Ingredient Trifluralin
Concentrated No
Recommended for Brush No
Pre-Emergent Yes
For Use Along Fences No

7. Prodiamine 65 Wdg Herbicide (generic Barricade) – 5 lbs.

Prodiamine 65 Wdg Herbicide (generic Barricade) - 5 lbs.

  • Effectively controls Annual Bluegrass and Crabbgrass as well as many other annual grass and broadleaf weeds.
  • Active ingredient rate as low as 1/4 the rate of other pre-emergent herbicides.
  • Excellent tank mix partner with fertilizers and iron solutions.
  • Safe for over the top applications in shrub and flower beds.
  • Pre-emergent grass and broadleaf weed control. Flexible application allows for both spring and fall use providing season long crabgrass control.

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Product Details

Specifications

Details
Restricted Use No
Application Methods Broadcast Spray, Spot Treatment
Active Ingredient Prodiamine 65.0%
Chemical Type Herbicide
Formulation Water Dispersible Granule (WDG)
Use Sites Outdoors
Comparable Products Barricade Herbicide, Prodiamine 4L

8. Spectracide Weed Stop, For Lawns, For St. Augustine & Centipede Lawns, Concentrate – 32 fl oz

Spectracide Weed Stop, For Lawns, For St. Augustine & Centipede Lawns, Concentrate - 32 fl oz

  • Ready-To-Spray
  • Specially Formulated For Use On St.
  • Won T Harm Lawns
  • Kills The Toughest Weeds As Listed Including Dollarweed And Sandspur
  • 4% Atrazine

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HardwareAndTools.com

Product Details

Specifications

Details
Units in Package 1
Unit Size 32 fl oz
Directions Read the entire label before use. It is a violation of Federal law to use this product in a manner inconsistent with its labeling. Entry restriction: Do not allow people or pets to enter the treated area until sprays have dried. 1. Shake container well before using. 2. Connect a garden hose to the ready spray nozzle. Make sure the dial on the nozzle is in teh off position with the safety tab in the valve notch. 3. Turn on water at faucet. Extend hose to the farthest area to be treated and work back toward the faucet so you don’t come in contact with treated area. 4. To begin spraying, point nozzle toward treatment site and a.) bend the safety tab back (located at right of dial) with your thumb, b.) hold while turning dial clockwise until it stops. Water will automatically mix with product. 5. Spray until wet to control listed weeds. Walk at a steady pace while spraying, using an even sweeping motion. 6. To stop spraying, quickly turn the dial counterclockwise until it stops and the safety tab engages into the notch on the valve. Turn water off at faucet. To relieve pressure before removing nozzle from hose, bend the safety tab back and turn dial on until water stops spraying. 7. To store unused product, make sure the dial is in the off position with safety tab in the valve notch. Place in cool area away from heat, sunlight or open flame. Do not use near desirable plants as injury may occur. Do not apply under windy conditions. Do not treat the same area twice. Do not apply when temperatures exceed 90 degrees F as lawn injury may occur. Use only on healthy home lawns that are not under heat or drought stress and are reasonably free of insects, nematodes or diseases. Do not use on muck or alkaline soils. Do not apply in the root zone of trees, ornamentals or vegetables or other desirable plants other than the listed grasses. Do not apply to areas where natural drainage would carry the spray to desirable plants. Do not replant treated areas, except with listed grasses, within 12 months of application or injury may result. Do not oversee treated areas within six months after application. Sprigging listed grasses in treated areas is acceptable; however, some yellowing or stunting may occur. Application restrictions: Do not apply this product in a way that will contact any person or pet, either directly or through drift. Keep people and pets out of the area during application. This 32 fl oz container will treat 3,720 sq ft of listed grasses. Do not apply the entire container to an area less than 3,720 sq ft. Do not apply to the same area more than two times per year. Weeds controlled or partially controlled in established St. Augustinegrass and Centipedegrass lawns: annual bluegrass, chickweed (common and mouseear), crabgrass (partial control), cransbil, cudweed, dichondra, dollarweed, Florida betony, henbit, knotweed, lespedeza, moneywort, mustards, narrowleaf vetch, parsley-piert, pennywort (dollarweed), sandspur, smutgrass, spurge, spurweed, swinecrest, woodsorrel, and various annual clovers. Spurweed: control can best be obtained by applying when spurweed has just emerged (December and January). Florida betony: For best control, applications should be made in mid- to late October followed by a second application in mid- to late February. Dichondra, moneywort: Apply in early April followed by a second application in July. Applications for control of spurweed or Florida betony will generally give control or partial control of the other listed weeds. However, this product will give best control when applied to tender young weeds or just prior to weed emergence. Spectracide Weed Stop for Lawns for St. Augustine & Centipede Lawns Concentrate may be applied during both dormant and growing seasons. Best results are obtained when application takes place in early spring or dormant periods when weeds are small or have not emerged. Do not apply more than twice per year to the same area. This product will control both emerged weeds and weeds from seeds. Rain or watering within two or three days of application may decrease the effectiveness on emerged weeds. However, for the control of emerged weeds from seeds, rainfall or watering is needed within seven to 10 days after treatment. Storage and disposal: Do not contaminate water, food, or feed by storage and disposal. Pesticide Storage: Store in a locked storage area. Container disposal: If empty: Nonrefillable container. Do not reuse or refill this container. Offer for recycling, if available. Pesticide disposal: If partly filled: Call your local solid waste agency for disposal instructions. Never place unused product down any indoor or outdoor drain.
Ingredients Active Ingredient: Atrazine (4.00%). Related Compounds (0.08%). Inert Ingredients (95.92%).
Warnings Keep out of reach of children. Hazards to humans and domestic animals. Harmful if swallowed or absorbed through skin. Avoid contact with skin, eyes or clothing. First aid: If swallowed: Call a Poison Control Center or doctor immediately for treatment advice. Have person sip a glass of water if able to swallow. Do not induce vomiting unless told to do so by a Poison Control Center or doctor. Do not give anything by mouth to an unconscious person. If on skin or clothing: Take off contaminated clothing. Rinse skin immediately with plenty of water for 15-20 minutes. Call a Poison Control Center or doctor for treatment advice. Note to physician: There is no specific antidote for Atrazine. If the product is ingested, induce emesis or lavage stomach. The use of an aqueous slurry of activated charcoal may be considered. Have the product container or label with you when calling a Poison Control Center or doctor for treatment advice. Environmental hazards: Atrazine can travel (seep or leach) through the soil and can enter groundwater, which may be used as drinking water. Atrazine has been found in drinking water. Users are advised not to apply to sand and loamy soils where the water table (groundwater) is close to the surface and where the soils are very permeable, i.e. well-drained. Your local agricultural agencies can provide further information on the type of soil in your area and the location of the groundwater. This pesticide is toxic to aquatic invertebrates. Do not apply directly to water or to areas where surface water is present or to the intertidal areas below the mean high-water mark. Do not apply when weather conditions favor drift from treated areas. Runoff and drift from the treated areas may be hazardous to aquatic organisms in neighboring areas.

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musicmonger

9. 16-lb St. Augustine Weed and Feed 15-0-4

16-lb St. Augustine Weed and Feed 15-0-4

  • 16 lb

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Product Details

Specifications

Details
Primary Usage Weed & Feed
Grass Type St. Augustine Grass
Coverage Area 2500 sq ft
Water Soluble Yes
Application Season Spring

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Yardmaster
Lawnman

10. Southern Ag Surflan A.S. Specialty Herbicide Pre-Emergent Herbicide, 8oz

Southern Ag Surflan A.S. Specialty Herbicide Pre-Emergent Herbicide, 8oz

  • 8 oz

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Product Details

Specifications

Details
Active Ingredient Oryzalin – 40.4%
Pet safe Yes, if followed by directions on label
NOT FOR SALE TO CA

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qagman
desmith303045

11. IMAGE By Lilly Miller Casoron – Granules – 8 lb bag

IMAGE By Lilly Miller Casoron - Granules - 8 lb bag

  • Size: 3.6kg.
  • Ready to use.
  • One application for all seasons.
  • Prevents 52 weeds and grasses around established trees, and shrubs.
  • Ideal for use: Around roses and listed shrubs and trees.

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Product Details

Specifications

Details
Coverage Area 1700 sq ft
Targeted Weed Weed and Grass
Organic No
Product Form Granules
OMRI Certified No

12. Barricade Pre-Emergent Herbicide 50#Bag – Nitrophos Prodiamine

Barricade Pre-Emergent Herbicide 50#Bag - Nitrophos Prodiamine

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Product Details

Specifications

Details
Restricted Use No
Application Equipment Hand Spreader, Push Spreader
Application Methods Granular Spreading
Chemical Type Herbicide
Formulation Granular

13. Image Southern Lawn Weed Killer Concentrate, 32 Oz.

Image Southern Lawn Weed Killer Concentrate, 32 Oz.

  • Kills the toughest weeds down to the root
  • For use on Southern lawns including St
  • Augustine and Centipede
  • Fast acting
  • Kills the toughest weeds-down to the root

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Product Details

Specifications

Details
Contains Glyphosate No
Lowe’s Exclusive No
Safer For Pets No
Pre-Emergent No
OMRI Listed No

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Yong

14. Greenview – Preen Lawn Crabgrass Control 15 lb

Greenview - Preen Lawn Crabgrass Control 15 lb

  • It also provides post-emergence control of seedling crabgrass for up to 4 weeks after it germinates.
  • Preen Lawn Crabgrass Control should be applied to lawns and ornamental turfgrasses that are well established.
  • When used according to the directions, it will not harm nearby established ornamentals.

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Product Details

Specifications

Details
Organic No
Product Form Granules
Rain Proof Yes
OMRI Certified No
Product Type Control

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germslopz
Mazzle

15. Safer Brand Weed Prevention Plus – 5 lb

Safer Brand Weed Prevention Plus - 5 lb

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Safer Brand Organics
DK Hardware
Gemplers

Product Details

Specifications

Details
Emergent Type Pre-Emergent
Concentrated or Ready to Use Ready to use
Application Type Granular
Compatible Grass Type All Purpose
Safe for Edibles Yes

16. Espoma 25 lb Organic Weed Preventer

Espoma 25 lb Organic Weed Preventer

  • 25#

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Product Details

Specifications

Details
Fertilizer Analysis (N-P-K) 9-0-0
Coverage Area 1250 sq ft
Organic Yes
Container Size 25 lb
Water Soluble Yes

17. Speedzone Southern Broadleaf Herbicide for Turf – 1 Gallon

Speedzone Southern Broadleaf Herbicide for Turf - 1 Gallon

  • 1 Gal

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Product Details

Specifications

Details
EPA Reg. No 2217-835
Active Ingredients 2,4-D, MCPP, Dicamba, Carfentrazone
Formulation Details Emulsifiable Concentrate
Application Methods Spot Spray, Broadcast Spray

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18. Preen 10 lbs. Lawn Weed Control

Preen 10 lbs. Lawn Weed Control

  • 10 lb

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Ideal True Value Home Center
PlumbersStock.com
Shell Lumber and Hardware

Product Details

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Hoosiernorth

19. Concern 25 lb. Weed Prevention Plus

Concern 25 lb. Weed Prevention Plus

  • For use in flower gardens vegetable gardens and in landscaping areas
  • Ideal for use under bird feeders
  • Safe for children and pets
  • Fast green up and will not burn
  • Made in the usa

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Esbenshade’s Garden Center

Product Details

Specifications

Details
Product Type Weed Preventer
Application Season All Season
Targeted Weed Weed
Container Size 25 lb
Product Form Granules

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RandomShopper

20. Wow! Supreme Pre-Emergent Weed Killer and Lawn Fertilizer – 35 lb. Bag

Wow! Supreme Pre-Emergent Weed Killer and Lawn Fertilizer - 35 lb. Bag

Product Details

Specifications

Details
Season both Spring & Fall

Conclusion

Pre-emergent herbicides work by creating a barrier on the surface of the soil that prevents weed seeds from germinating. This barrier is only effective for a limited amount of time, so it is important to reapply the herbicide according to the manufacturer’s instructions.

St. Augustine grass is a warm-season grass that is native to the southeastern United States. It is a popular choice for lawns because it is tolerant of heat and shade.

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