IMHO, unless there are soft, "mushy" areas on the rhizomes (if there ARE...send them back, and don't buy from that vendor, again!!) DON'T give them a bleach water dip ! If you take a shallow pan, put a little water in it, and set the plants in it....trying to keep the rhizome OUT of the water, and the roots IN the water....and let them set a few hours, it will give them a bit of a "headstart"....but, it's really not necessary . Follow the planting depth guidelines that you'll find on almost every "iris site'.......not too deep (the top half of the rhizome should be visible when the ground has settled). Water when the soil around the plant has dried to a depth of 2"-3".....and remember, the RHYZOME doesn't need water, the ROOTS do ! Keep the weeds out, and the sunshine in....and enjoy the bloom next spring!