I've had it suggested that it might be a way to
keep some of the more tender Arils. The only time I've heard of storing TB
irises this way was done by accident (for 2 years). After discovering the bag,
they were planted out and most came through just fine.
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This is a blog from SpringHill. Read all the
way down. In the 56 years I've raised irises, I've never heard of
lifting and storing iris rhizomes in paper bags. Anyone else?