Dutch iris...problems in Ohio

Athens, OH

In NC, I had lush sweeps of dutch iris, but here in SE OH they are feebile.

I have tried planting them in the Spring and Fall, from Walmart to high end bulb suppliers.

The first year or two they do well and then fade away.
Note: they don't seem to rapidly disappear or I would suspect critters.

Any ideas?
I do use amended soil: 1/3 composted manure, 1/3 clay, 1/3 humus.

ROX

Athens, OH

See above.
Note the iris reticulata do splendidly.
ROX

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