Most Canna are hardy to Zone 8 and are marginal in Zone 7. Your garden’s microclimate can make a difference. Luckily, Cannas are easy to dig up and store during the winter, and because they increase so rapidly during the season, you can experiment by bringing some indoors and leaving some outside, well-mulched.
If digging, do so in late fall, when the foliage has begun to brown. Lightly brush away soil and cut back foliage to within 2” of the rhizomes. If congested, you can cut the rhizomes apart with a sharp, clean knife, removing any rotten areas.
Do not wash the bulbs, but let them dry out for a day or two in a sheltered spot, then store in plastic bags in a cool but frost-free, dark area. Leave the bags loosely closed for ventilation.
In spring, when soil temperatures have warmed, take out the rhizomes and plant just as you did the season before, discarding any that have rotted or dried out.
Let Cannas energize and enhance your garden this season with exotic foliage, unusual flowers and strong vertical lines. With unmatched versatility, Canna Lilies might just act as your secret weapon in the face of a hot, challenging summer!