Hardiness Zone: 7a
Elaine from Charlottesville, VA
You can use the same method to store both types of tubers over winter. As soon as the tops turn yellow and start to die back (usually the first or second fall frost), carefully lift the plants out of the ground. Go ahead and cut the stems back to the tubers, but leave the roots and any soil attached intact. Allow the tubers to cure for a week or two and then clean off the remaining soil and trim the roots. Dusting the tubers with a fungicide before storage is optional. An easy way to do this is to shake them in a paper bag filled with a bit of dust. The tubers can be layered in a box filled with dry peat, sand, sawdust or vermiculite. Stored in a dry room at temperatures between 50-55ºF. Check on them periodically. If they appear to be shriveling due to moisture loss, sprinkle them with a few drops of water.
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You should wait to pull the bulbs out until they are done for the season. So long as they are still green and leafy they are still making food for the bulb. Once they are done, cut the foliage off and store the bulbs in a cool dry place. They can be wrapped in newspaper, stored in dry peat moss or saw dust would work too. Do not allow them to freeze though. Once the ground is thawed and the risk of frost is past you can replant them. (10/09/2006)
I store Caladium, Dahlias, and Cannas all in peat moss in the basement over the winter. Had them for years. (10/20/2006)
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