hi Kathleen and other PCI growers, My only experience with these is to buy them in a gallon pot from our botanic garden, plant them, and then do absolutely no maintenance whatsoever for 2 decades. They multiply and bloom all on their own. I do not cut-back, water or dead-head them and I seldom weed them. One clump is now invaded with Bermuda grass which is difficult to eradicate so I have to dig it up to get those grass rhizomes out. The only times I have tried to transplant these kind of iris they all promptly died. So, my question is: which season is best to dig these up? Right now they have small new shoots emerging. I vaguely remember mine might be I. douglasiana or a cultivar or hybrid of those. It is the white blooming clump which I have to dig up. They are definitely Pacific Coast Irises. - Gastil Santa Barbara, California (on the Pacific Coast)