Answer: Cannas never really go dormant. In warm winter areas such as Florida and California, they grow nearly year around. They're dug and stored in cold winter areas such as yours so winter weather won't kill them. They've begun sprouting because of the temperature. They may continue to sprout, or they may suspend their growth due to low light levels. I'd just leave them where they are and check periodically to make sure the rhizomes do not dehydrate. If they insist on continuing to grow, you can pot them up and keep the potting soil moist. I suspect, though, that they will simply stop growing until they're planted outdoors next spring. Happy Holidays!
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