I don't have the luxury of putting my irises in the ground at my current house, so they're all in pots for the next few years. I modified the recipe on the Scrheiners website and they have been very happy. They said 45% fir bark, 20% pumice, and 35% peat moss. I had trouble finding the pine bark, so I picked a nice mulch, subbed the perlite for the pumice. Plus a little bone meal when I plant.
