If it's before the first frost, you can try to overwinter your mums by planting them in the garden. This allows them some time to set roots before the cold settles in. Don't prune them, and cover the base with a good layer of mulch.u003cbr/u003eu003cbr/u003eYou can also try to leave them in the container. In this case, move them to a place where they'll be protected, like underneath an evergreen tree or in a garden shed.