Hello 👋🏼😀 - well I would make sure you leave the surface of the rhizome showing above the soil, so that it is exposed to the sun. Bearded Iris rhizomes like to bake in the summer sun, and so you literally plant them in a trench just a few cm deep on the surface. Cut the foliage down too to ensure they don't blow around in the wind as this rocks the rhizome which prevents the roots from forming. I'll tag you in a few pics to see what I mean 👍🏼 mine are doing well in full sun.
@richard.spicer.7906 I don't really understand what you mean by leaving the surface of the rhizome showing above the soil. I guess even after looking up rhizome definition, I still don't really understand what it is. Could you help me understand?