@Topdecker
They should be just fine planted as you describe. (If you got them from Hallson, the planting depth will be marked on the stem.) I am also in MO in zone 6a. Some hardy hibiscus grow wild here. They struggle in zone 4, but here the summer heat stresses them more than our winters. They need LOTS of water when it gets hot. My Cranberry Crush drops buds if I don't keep its soil fairly soggy during July and August.
They will break dormancy in early May in our zone, so be patient with them.
