CULT: Bloom Out, Preventing

    I would like ideas on how to encourage Iris which look like they are heading towards bloom out, to start growing new plant growth!  I apologize if this has been discussed before and I didn't catch it.   I have a guest garden for our Region's Spring garden tour meeting for next year.  I am looking at my guest bed plants which are blooming nicely the first year, and see a few problems.   The vast majority are showing nice increase on the plants, however, I have a few that are blooming on the single rhizome with no sign of new increase.
    The only ideas I have heard in years past is to throw extra fertilizer on the plant.  If any of you have successful ideas and/or what not to do, I would appreciate your comments.   Thanks.
 
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