When I lived in Minnesota, mums were not something gardeners expected to survive as a perennial plant. Mums showed up at garden centers in pots for seasonal color. The University of MN did hybridize and sell a few that were said to be winter hardy, but mine only survived two winters in the ground.
Here in Western Washington mums have many followers and clubs. I have learned an amazing amount of information about the 13 classifications of mums and how to grow them. It takes patience and a lot of potting up because mums like to be root bound in a pot. I am used to roses where you get several flushes of bloom every season. Finally I am seeing some plants blooms! Check back over the next few weeks as other plants come into bloom.