The Roundup Dual Action Weed & Grass Killer + 4-Month Preventer is a concentrated herbicide designed to both eliminate existing weeds and stop new growth for extended control. Its dual-action formula creates a soil barrier while killing weeds down to the root, making it ideal for long-term maintenance in non-lawn areas.

• Kills existing weeds and grasses to the root for complete control
• Prevents new weeds for up to 4 months by forming a barrier in the soil
• Rainproof in as little as 30 minutes after application
• Visible results in as fast as 6 hours with full kill in 1–2 weeks
• Covers up to ~1,600 sq. ft. depending on mix rate
• Ideal for driveways, sidewalks, patios, fence lines, mulch beds, and gravel areas
• Tank sprayer application with mix rate of approx. 6 oz per gallon