LOLLLLLL. 2 falls ago (Fall 2010) I received a ton of iris rhizomes from a fellow gardener here (Zuzu) and when I buried them along my fenceline in the backyard, I did the "burial plot" thing as the ground was solid from lack of moisture. In fact, when I put them in, it looked like I buried like 50 tiny mouse bodies with the fans sticking up as headstones! Too bad I didn't take a picture.. it was funny as anything. Sometimes if the ground's just too darned hard, I just cover the rhizome with rocks (specifically in my rock bed in the front). Anything to protect it from the sun. They can take heat, but not sun.