. I am a believer that pre-emerges chemically root prune desirable plants. Therefore I don't agree with broadcast applications. Somewhere in the middle each person finds what works best for them. Cultural practise are as important as chemical if not more important. Proper irrigation and good mulch go a long way in bed weed control. What I found was, the same spots are where the weeds always grow. Therefore I added a Pre Emerge to my roundup and it works for me. Call it mixing my own "Roundup Extend" .