QUESTION: I have some cannas that have not bloomed for several years. I think their spot has become too shady, so I want to move them. Is now the right time? Should I wait until the leaves die back after frost?ANSWER: If your cannas have not bloomed in that length of time, they definitely need a home in a sunnier spot. You should replant the rhizomes next spring, 4 inches deep and about 1 foot apart. You can dig up the plants this fall, cut off the stems and foliage and store the rhizomes in a paper bag with dry peat moss in a cool but frost-free place. Gardeners typically do this after frost blackens the foliage.Even if you leave the rhizomes in the ground over the winter, you must cut off and clear away all stems and foliage. This debris is where a destructive pest of cannas called leafroller spends the winter in its dormant stage.