Roundup Dual Action Weed & Grass Killer Plus 4 Month Preventer Refill 1.25 gal

Two-in-one weed control that works where it matters

Roundup Dual Action Weed & Grass Killer Plus 4 Month Preventer is designed to address both existing weeds and future invaders. It kills weeds and grasses down to the root while forming an invisible soil barrier that can help deter new growth for up to 4 months. Use it in spaces where you want a cleaner surface—cracks and crevices in driveways, sidewalks, and patios; along fences; in mulched beds; or around the base of established plants and trees. For best results, ensure you cover the entire area you want controlled, not just the emerged weeds.

How it works

The formula combines an effective weed killer with a long-lasting preventive barrier. You may see weeds yellowing and wilting within hours, with full elimination often occurring in 1–2 weeks. The barrier remains active after application to slow fresh arrivals, helping you maintain cleaner spaces between treatments. In addition, the product is rainproof in as fast as 30 minutes, so a light shower won’t undermine the treatment.

Where to apply

This versatile solution works on hardscapes and landscapes alike. Ideal spots include:

• Cracks and crevices in driveways, sidewalks, and patios
• Along fences and edging borders
• Mulched beds or around the base of desirable shrubs and trees
• Gravel areas and other nonsoil surfaces

Timing and results

Apply during warm, sunny weather above 60°F for best performance. After application, avoid washing away effects with rain or watering for at least 30 minutes. You can expect visible changes quickly, with leaves and stems browning within hours and complete kill typically in 1–2 weeks. When you’re ready to replant, ornamental bedding plants, trees, shrubs, sod, and seed can be planted 4 months after treatment.

Why choose the refill

The Roundup Dual Action Refill provides an easy, economical way to replenish your Ready-to-Use applicator, helping maintain consistent weed control over time. The refill covers up to 375 sq ft per package, making it a practical option for larger areas or multiple spaces.

Tips for best results

• Apply during warm, sunny weather above 60°F
• Spray the entire area you want to control, not just the visible weeds
• Avoid applying directly to ornamental bedding plants, trees, shrubs, sod, or seed during treatment
• Rain or watering 30 minutes after application will not wash away effectiveness