They were easy to grow but did not over winter here in zone 5. Maybe you would have better luck. Blue Stone Perinnials had a nice selection of them. Other mums over wintered well though.

I overwinter them in my greenhouse. They had aphids so badly A month ago I hacked them all back and took them outside. We are having mild weather, only a few nights under 32 degrees. The first couple of nights I covered them. Now I only will if we get something dramatically colder. The aphids are gone and they are starting nice regrowth. I buy from Kings Chrysanthmums on the web. I grow them in very large pots over the summer. They do tend to dry out fast in the greenhouse over the winter even when the air is moist. They must have monster roots in those pots!

I took cuttings of all mine before setting them outside. My plan is to plant the overwintered ones in pots into the ground this spring, and grow the rooted cuttings on in pots for the fall. Some really gorgeous ones I would hate to lose!

Our season is not long enough to bloom out a lot of the later ones. I will set the pots on the south side of my greenhouse and maybe try covering them with plastic to bloom this fall. I am counting on more sun this year...couldn't get much less then last years gloom!