How Long Does Roundup Proactive Take To WorkHow Long Does Roundup Proactive Take To Work August 1, 2021August 1, 2021| fkdtsoreangfkdtsoreang| 0 Comment | 1:11 pm For roundup weed & grass killer super concentrate, use from 1 1/2 ounces, or 3 tablespoons, to 2 1/2 ounces, or 5. Though glyphosate is now sold under other names View MoreView More