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Iris that grow from a rhizome, such as the Bearded Iris, are divided in the winter months or early spring in climates that are warm temperate. Iris that grow from bulbs, such as the Dutch Iris, are dug and divided when the foliage has died off after flowering, or any time until regrowth starts again.

Irises can be transplanted or divided in late summer. The reason for this is they are susceptible to bacterial soft rot and need the heat and dryness of late summer to prevent this. Also do not plant too deep or they will rot. The rhizome should be slightly exposed. Check for any soft spots on the rhizome. It could be soft rot or an iris borer, either way cut that part off of the rhizome with a sharp knife.
You separate Iris flowers when they do not bloom. This means they are in a "bunch" and need to be separated in order to produce blooms, not foliage.
In the fall.

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9y ago

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