St. Augustine Grass Pre-Emergent

Why Use Pre-Emergent for St. Augustine Grass?

Keeping a St. Augustine lawn weed-free requires a proactive approach, and pre-emergent herbicides are the first line of defense. These products create a barrier in the soil that prevents weed seeds from germinating, stopping invasive weeds before they take hold. Using a pre-emergent for St. Augustine grass helps control common weeds like crabgrass, Poa annua, and broadleaf weeds without harming your turf.

For homeowners in warm climates like Texas and Florida, where St. Augustine grass grows year-round, a proper pre-emergent herbicide for St. Augustine grass is essential for seasonal weed prevention.

Best Pre-Emergent for St. Augustine Grass

0-0-7 Pre-Emergent

• Ideal for dormant or semi-dormant St. Augustine lawns
• Provides pre-emergent weed control without added nitrogen
• Great for fall applications when growth slows down or lawn is dormant

13-0-10 Pre-Emergent

• Contains stabilized nitrogen and iron to support early-season growth
• Best for actively growing St. Augustine lawns needing weed prevention
• Provides long-lasting control while improving turf color
• Apply both spring and fall when lawn is actively growing.

Spectacle Pre-Emergent

• A premium long-lasting pre-emergent weed killer
• Controls a wide variety of broadleaf and grassy weeds
• Preferred choice for fall pre-emergent for St. Augustine in high-pressure areas

When to Apply Pre-Emergent to St. Augustine Grass

Timing is critical when applying a pre-emergent for St. Augustine grass. The best times for application are:

• Spring: Apply before soil temperatures reach 55°F to prevent summer weeds like crabgrass.
• Fall: Apply in late summer to early fall to block winter weeds like Poa annua. Spectacle is a strong option for fall applications in Texas and Florida, where weed pressure is high year-round.

Using a pre-emergent fertilizer for St. Augustine grass ensures your lawn stays healthy while preventing weeds. Regular applications will help maintain a thick, weed-free lawn, reducing the need for post-emergent treatments later.