10/31/2022
Now is a great time to clean up those iris beds!
Cleaning- Remove any diseased leaves and leaf litter and throw in trash as fungi spores over-winter on infected debris. Cut back the rest of the foliage to 6" from the rhizome. Cutting leaves at an angle and creating a rounded fan shape will prevent rainwater from sitting on the cut surface and causing rot.
Inspecting- Now that you can see the rhizome clearly, inspect each rhizome for soft spots and dig up that rhizome. Cut out any decay back to healthy tissue. If the decay is not removed, the decay will continue to rot the healthy tissue and could potentially kill the entire rhizome. After all decayed areas are removed, replant the healthy portion of the rhizome.
Mulching-
We strongly advocate protective winter covering, particularly in the most northern sections. A light covering of loose material like straw, marsh hay or pine needles or a similar weed-free litter is highly advised. Newly set plants in particular must be protected as a preventative to the injury caused by freezing and thawing. Remove covering when spring growth begins. Late planted irises should have a brick placed on top of rhizome after the first hard freeze to prevent heaving.
https://gilberthwild.com/iris/