
Downtoearthdigs
Answered on October 30, 2015
Both your Canna and Calla Lily bulbs can overwinter outdoors in your zone.
Keep in mind that if they are needing to be divided or controlled from outgrowing a space it is best to lift them in the fall and make these divisions.
In warm zones they can be planted at any time in the spring.
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/calla-lily-winter-care.htm
https://www.gardeningknowhow.com/ornamental/bulbs/canna/storing-canna-bulbs.htm
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