Do Iris Rhizomes Bury Themselves?
Sorry if this is a duplicate. I just posted, and can't find the original so I think I did something wrong.
This Spring I planted heritage variety rhizomes from a supplier that sends them in April, for Spring blooming. I was careful to plant them with the tops of the rhizomes uncovered.
During the Spring and Summer, they rhizomes seemed to bury themselves, The tops are no longer visible.
This Summer, I moved some established clumps to a new location in a raised bed. Again, I was careful to have them slightly above the ground level. Those also seems to have buried themselves.
I am wondering if the roots somehow pull the rhizomes deeper into the ground? It's a soil mix that is 1/2 native topsoil, lots of clay, and 1/2 yard debris compost from a local recycling center. The bearded irises seem to thrive in this soil but I'm wondering if they will rot in the winter if the rhizomes are not exposed. The local climate is rain all winter, with occasional freeze. The irises are in raised beds.