Ok, first of all the Iris have most likly used up the soil, this is why big time
growers bring in big loads of new soil and make new fields with it about every 5
years. They should also be thined out so that there is new room for the toes to
grow out again. You can use just about any good fert. to till into and around
the iris. You should remove the dead fans, but leave the rest as even during
winter they are making food for the next springs blooms and new offshoots too.
"In this universe the night was falling,the shadows were lengthening
towards an east that would not know another dawn.
But elsewhere the stars were still young and the light of morning
lingered: and along the path he once had followed, man would one day go
Arthur C. Clarke, The City & The Stars
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