We would recommend delaying seeding for at least 4 weeks following applications of Crab-E-Rad Plus RTS. Please refer to the product label for completel application instructions.
We do have a few products labeled for controlling mugwort in lawns but not in ornamental beds. Care should be taken with any of the products as it could also harm the mazus. We did find a great article here by Unniversity of Tennessee that might help. Crab E Rad is one product labeled for it.
After treatment of Crab-E-Rad Plus RTS, we recommend not letting pets or children on the lawn until it dries, usually a couple of hours.