The iris rhizomes that have been planted in my garden thus far, which is filled with Compost and bagged Garden Soil, are growing quite well. I'm very pleased with how they are performing. The other Iris garden area that I have does not have any compost or bagged garden soil - the iris rhizomes were just planted in the ground/dirt that I had in the yard - they also are doing very well - that is the garden that "Beverly Sills"
bloomed in !