Gloria wrote:

When is the right time to divide Siberian Iris? Mine has finished blooming
and has made seed pods.

You can certainly divide it now if you wish. Generally, spring blooming
perennials are recommended to be divided in fall, later blooming ones in
spring. Personally, I divide anything whenever I have the time - nothing has
croaked yet!! And sibes are pretty tough plants.

pam - gardengal