- Dual-action formula works two ways
- Kills existing weeds and grasses to the root
- Prevents new weeds from growing for up to 4 months by creating an invisible barrier
- Rainproof in 30 minutes
- Visible results in 12 hours
Roundup Concetrate Extended Control Weed & Grass Killer Plus Weed Preventer does 2 jobs at once, it kills existing weeds and prevents new weeds for up to 4 months! Treat the weeds you see as well as the areas where you don’t want weeds. You can see visible results in as little as 12 hours. The conentrate formula is for use in a tank sprayer.