Written by 3:10 pm Herbicides, Lawn Tips

Best Weed Killer for St Augustine Grass

Keeping a St Augustine lawn free of pesky weeds is an annual battle. By selecting the best weed killers for St Augustine grass, you can reclaim your property from weeds and make your yard the envy of the block.

Below are several herbicides you can use throughout the year to keep your lawn weed-free.

 Pre-EmergentPost-Emergent
GranularFerti-Lome Broadleaf Weed Control with GalleryFerti-Lome Weed-Out Plus Lawn Fertilizer 25-0-4
LiquidPrincep Liquid HerbicideSouthern Ag Atrazine Weed Killer for St Augustine Grass

Pre-Emergent Weed Killers and St Augustine

Always begin your weed-control efforts in the winter months by applying a pre-emergent herbicide when St Augustine is dormant. This helps prevent weeds from taking root. Preventing the seeds of weeds from germinating prevents them from becoming a problem in the first place.

Best Granular Pre-Emergent Weed Killer for St Augustine Grass

Ferti-Lome Broadleaf Weed Control with Gallery

Ferti-Lome Broadleaf weed control is the best granule pre-emergent herbicide for St Augustine grass. Ferti-Lome’s product will provide your lawn with protection from over 40 common weeds. We recommend you apply this herbicide before or after the growing season.

Isoxaben is the active ingredient in the product and is safe for application to St Augustine grass. Do not apply Ferti-Lome Broadleaf Weed Killer more than three times a year to St Augustine lawns.

Best Liquid Pre-Emergent for St Augustine

Princep Liquid Herbicide

If you opt for a liquid pre-emergent herbicide, Princep Herbicide is a top-of-the-line, professional-grade herbicide. Princip protects against 60+ most common weeds. Safe for St Augustine grass, Princep Liquid Herbicide prevents weeds from taking root in your lawn.

Do not apply this herbicide more than twice per year, which is why we recommend an application in both the spring and fall.

Dilute the herbicide with water before applying. The product can be applied using a bottle sprayer, backpack, or ATV mounted sprayer. Always follow the manufacturer’s warnings and application instructions when using this product.

Post-Emergent Weed Killers for St Augustine

After the growing season has begun and the days have gotten warmer, you should use a post-emergent herbicide on your St Augustine. Pre-emergent products will keep weeds from growing for 45-60 days.

St Augustine is sensitive to 2, 4-D, a popular herbicide found in weed killers. Use herbicides that have Atrazine as the active ingredient instead. Most post-emergent herbicides will need to be applied two to three-time during the growing season.

Best Granular Post-Emergent for St Augustine

Ferti-Lome Weed-Out Plus Lawn Fertilizer 25-0-4

Ferti-Lome Weed Out is a granular post-emergent herbicide for St Augustine lawns. It features a potent combination of three different herbicides that kill weeds. The product is a weed-and-feed and contains a 25-0-4 fertilizer, making it perfect for growing season applications.

Weed and feed products combine weed management and fertilizer. Multiple applications can be made throughout the summer months as needed using a hand or push spreader. Do not apply weed and feed products in early spring or late fall. Also, be sure to follow the manufacturer’s warnings and application instructions when using this product.

Best Liquid Post-Emergent for St Augustine

Southern Ag Atrazine Weed Killer for St Augustine Grass

Southern Ag’s Atrazine Weed Killer is one of the most common herbicides for St Augustine grass. Featuring Atrazine as the active ingredient, Southern Ag’s product is safe for St Augustine turf. It is also an efficient killer of weeds.

The liquid herbicide will need to be diluted before application. You can use it for spot treatments or for treating entire lawns. One gallon of product can treat up to 14,000 sq ft, making it a bargain!

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