Are mum perennials or annuals? I live in zone 6. I planted about 11 mums in the early fall and they have "died" throughout the winter - will they come back green and flower again or are the brown branches brown and dead for good now?
There are both perennial and annual mums. If you purchased them in the fall they are most likely perennials. The top of the plant dies off for the winter and the plants become dormant for the winter. As soon as the danger of a hard frost has past you can prune the dead branches to the ground. Here's some helpful info on mums.