Irises

Asked June 13, 2018, 9:32 PM EDT

I need to thin out my irises this year. How soon can they be dug up after the flowers are done to dry out to replant this fall?

Saginaw County Michigan

1 Response

Hello,

Irises continue their underground growth for about three weeks after blooming. The best time to divide your irises is during their semi- dormancy which is anytime from July through August. Replanting at this time gives the plants time to develop a good root system before heading into winter. This is also a great time to check for any diseased or damaged rhizomes and discard.

The following links will give you more detailed information:

https://www.extension.umn.edu/garden/yard-garden/flowers/iris/

https://www.irises.org/

https://www.extension.umn.edu/garden/insects/find/iris-borers/