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The bulbs need to be kept at 35 to 45 degrees F. for the entire cooling period of 16 to 18 weeks. If you live where outdoor winter temperatures rarely get below 25 degrees F, just keep the pots of bulbs moist and store them right in the garden beneath a layer of straw.
No Guarantees for Cold Hardiness. Canna bulbs are generally not cold hardy outside of tropical or warm winter areas. You can consider a canna bulb to be cold hardy if it can survive the average winter in your garden. Canna bulbs have a limited ability to enter a dormant state during periods of extended cold weather.If you can keep the bulbs relatively warm and dry, they may bloom in the summer.or the winter months, cold-hardy canna might survive in the ground. Transplant cold-hardy bulbs, rather than leave them in the ground, when the predicted temperatures over the winter months are much lower than usual, or when the ground in the area is wet during winter.