Yeah .. you definitely don't want to use it around your Salvia or Monarda.
I put it on my front bed by the road before I planted my main plants .. I covered the perennials coming up with buckets then sprayed weed killer on the bed .. a few days later I hoed everything under then applied the Preen. Usually when I weed my beds I see new weeds coming up from seed within a day or two afterwards .. so far, and it's been about 4 days, I haven't see any new weeds coming up in the bed. I check it every day.
I'm considering doing half my round bed with Preen and the other half without just as a test.
