If you type in "Iris" after Dardanus, or even "plant", there is lots of info available. What I found basically says to treat them like a bearded irs, Rhyzome near the surface in well drained soil.
On Sat, Oct 8, 2011 at 10:29 AM, gardens_r4_me <email@example.com>
I just recieved my order of DARDANUS and I have not a clue how to plant them. I can't find any information on the internet, either. The rhizome has a cut end, an end where there was a stalk, a few nodes on the sides & its kinda flat-ish. Laid out flat, I can't really tell which side is the top. I think there are some remnants of roots on one side. So, do I plant it flat as a cristata? vertical as a bulb? or diagonally as a peony? How deep? I have found other cultural info, just not planting instructions! If anyone can help, please do so. Thanks so much. Patty