you'll always be absolutely...clear. weeds. nature's boomerang. at roundup®, we know they keep coming back. you never invited this stubborn little rascal to your patio. so, draw the line. one spray of roundup® max control 365 kills to the root and keeps weeds away for up to 12 months. because patios should be for cooking out and kicking back. roundup® max control 365. draw the line. prevent weeds from coming back for up to one year.