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...they won't bloom at all in Spring. Still, it is the best plan if you want them to be happy in their new home. Dig them up now, and cut the fans back to 2" or so. Inspect the rhizomes carefully and discard any that have insect damage, soft- or rotten-looking spots, or other signs of ::shudder:: Iris borers. Nasty little worms that eat into the rhizomes. Just toss any that look doubtful.
Then leave them out in a dry, sunny place for a few days to let them dry completely and harden. After that you can bag them in a paper bag or a mesh bag, with or without sawdust, and put them in a cool dark place for the winter. The key is to keep them from getting damp or mildewed but don't let them freeze hard. Cool and dry, all winter. Plant them out as soon as the ground is workable in spring.
They won't bloom for you in spring, but the rebloomers might put out a late-summer show for you. And the following spring they'll be simply gorgeous. They need moisture in spring to get going and bloom, then a dry summer, then a little moisture in early fall to store up for winter. Keep them as clean as possible, let the rhizomes' backs get some sun, and divide them and re-plant every few years as they start crowding. Don't let damp litter collect around the rhizomes, that's an invitation to disease and borers.
horticulturally, Bright
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