How deep should I plant bearded irises?

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How deep should I plant bearded irises?

Answer: 

When planting bearded irises, dig a hole large enough to accommodate the rhizome and roots.  Build a mound in the center of the hole.  Place the rhizome on top of the mound and spread the roots in the surrounding trench.  Then cover with soil.  When planted, the rhizome should be just below the soil surface.  

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