Zoysia Grass Pre-Emergent

Keep your Zoysia lawn weed-free and looking its best year-round with our premium pre-emergent products. Zoysia grass thrives in warm climates, but unwanted weeds like crabgrass, goosegrass, and annual sedges can quickly take over if not stopped early. Our specialized Zoysia grass pre-emergent herbicides create a protective barrier in the soil to prevent weed seeds from sprouting—before they become a problem.

Whether you're preparing your lawn in early spring or fall, our pre-emergents are formulated to support Zoysia's slow-growing habit while offering added nutrients to keep your lawn healthy.

When to Apply Pre-Emergent to Zoysia Grass

Timing is everything. For the best results, apply pre-emergent to your Zoysia lawn twice a year:

• Early Spring (Jan 15 – March 15): Apply before soil temps hit 55°F to block crabgrass and other spring/summer annuals.
• Early Fall (Sept 1 – Oct 15): Apply before soil temps drop below 70°F to prevent Poa annua and winter weeds.

Avoid applying if you plan to seed or overseed—pre-emergent will prevent both weeds and grass seed from germinating.

What Makes a Good Zoysia Pre-Emergent Fertilizer

Zoysia grass is slow to green up and doesn’t like being pushed too hard with nitrogen early in the season. The best Zoysia pre-emergent products will:

• Use Prodiamine or Dithiopyr for long-lasting weed prevention
• Include low or balanced nitrogen to avoid stressing Zoysia
• Contain potassium for root strength and disease resistance
• Be safe for warm-season lawns

Recommended Products for Zoysia Grass

Guardian 13-0-10 Pre-Emergent Fertilizer with Prodiamine

• Prevents crabgrass, Poa annua, and broadleaf weeds
• 13% nitrogen feeds gently while 10% potassium strengthens roots
• Perfect for early spring and early fall use on Zoysia lawns

0-0-7 Pre-Emergent with Prodiamine

• Fertilizer-free option for areas with adequate nitrogen already
• Best for early spring when lawn is still dormant or paired with a separate fertilizer
• Ideal for low-nitrogen needs of Zoysia in cooler months

How to Apply Pre-Emergent on Zoysia Grass

• Apply using a broadcast spreader evenly across the lawn
• Water in with at least 0.25–0.5 inches of irrigation or rainfall within 24 hours
• Do not disturb the soil after application—this can break the weed barrier
• Reapply in 6–8 weeks if using a shorter-duration product (like Dithiopyr)