Planting iris rhizomes correctly

Canton, IL

I have several iris rhizomes coming July - Aug. I want to make sure I have the soil ready for them and also then how to correctly plant the rhizomes.

Please would anyone help me with making sure the soil is ready and what to add to it to improve it? I have the grey, tan, whitish clay, that is backfill for an old open pit coal mine. Reclaimed strip mine/open pit mine ground.

What I have that can be used if needed: I have horse manure, chicken house bedding -- shredded pine with lots and lots of chicken poop. I can easily get sand.

I was thinking I would work on the soil now, so it can have the next few months for any fertilizer or such to settle into the ground and enrich it over time.

I also need to know how to correctly plant the rhizomes.
For most of my life I had always been taught to lay the rhizomes just under the soil and lightly cover the rhizome. Do not, put them in the soil as if they are a bulb, standing up. They are to lay horizontal.

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