Small iris rhizomes

Jacksonville, IL(Zone 5a)

I am transplanting beds of iris for a friend. They have been in the ground for 25+ years and have stopped blooming. I figured it was because they hadn't been divided and expected to find rhizomes with many babies attached. But to my surprise, when I started digging, I found small rhizomes and no babies.

So, what can I do when I transplant them to encourage growth and bloom? I thought I'd put in bone meal and add ozmocote to the soil. Would this plan do the trick?

Thanks for your help. Rose

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