Answer: Callas go into a dormant period after blooming so if you water less frequently beginning late summer, the foliage will die back and the roots can rest. After the foliage has completely withered, cut it off at soil level. This is when the roots should be dug and stored in a protected place over the winter months. You can keep your callas in their original pots and simply store them dry until spring; new shoots will develop from the crowns of the plants when they've finished resting and you can set them back out in the garden at that time. If you want to replace the pot, I'd recommend digging the roots after the foliage dies down and repotting in the new pot, using dry potting soil. This way you can store the roots in their pots in a cool dry place for the winter. In the spring, take the pots back out to the garden and begin watering on a regular basis. The callas should spring to life. enjoy!
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