If you're growing canna lilies in Zone 7 and below, you'll need to lift and store the tender rhizomes in the winter months. Learn how on Gardener's Path.
CANNA LILY Overwintering - How to Store Bulbs (Rhizomes) over
Overwintering Canna Plants from Container Gardens
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All About Cannas American Meadows
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How to Overwinter Canna Lily Bulbs