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Can bare root miniature iris tubers be held in a cool place over winter and replanted in spring?
Hardiness Zone: 5a
By JoAnn Walker from Madison, WI
Unless you're moving and want to take them with you just leave them in the ground and they'll be just fine :-) I lived through 15 Michigan Winters and had dozens of Iris' both regular and miniature and never had a problem. Just had to divide them every three or four years in the Spring ;-)
In your zone after the ground has frozen, I would lay down mulch over the iris area. Iris are notorious for frost heaving because they are so shallowly planted. Frost heaving happens when there are freeze/thaw cycles over the course of the winter season. Even in my zone 6a the Iris will heave out of the soil.
Can the irises from grocery store chains be transplanted outside in the spring? Will they survive over the winter in zone 3?
By Gayle D.