Just S of the twin cities of M (Zone 4b)
|I keep Cannas year round in my zone 4b area, I have them in containers and just move them to the basement which stays around 50 deg, just giving them a little water each month.
I would try cutting them back, pot them up and take them to SC
Name: Tiffany purpleinopp
Opp, AL 🌵🌷⚘🌹🌻 (Zone 8b)
|If you put them in the ground in Z8, they can spend winters having an ideal dormancy, and in the spring, you can pry up a few around the edges to take up north. If you put some in the ground in Z6 in a spot that doesn't get soggy when it rains, and cover them with a decent pile of leaves, they could survive there anyway, with little danger of spreading wantonly beyond the designated area.
Be careful where you put them in Z8, they *never* stop creeping. Not suitable in a "flower bed" with other plants. Being surrounded by regularly-mowed area or some kind of concrete barrier is safe.
Silver Lake NY 14549 and Hilto
|By gosh it has been a crazy busy time ...just reading you helpful tip on my cannas....I put them in some giant pots until I can figure out the best drainage and sun area in our new home..thanks so much for your wonderful advice!