Yellow Japanese Iris-Pruning:

Question

I have yellow Japanese Iris plants. Can I harvest the seeds and plant? Before the winter comes how much of the leaves should I remove?

Answer 1

You can harvest the seeds once the pod has matured, and the seeds inside have darkened. You should not cut any foliage back unless it is dead, however. Cutting in green growth will introduce infection risk and cut off much needed nutrient storage. If you are dividing them, you can cut the top 1/3 of the leaves off, to force it to slow respiration. This helps during transplant.

This article will help you with the care of Japanese Iris: https://www.gardeningknowhow.com/ornamental/bulbs/iris/growing-japanese-iris-plants.htm