It's the same with irises. People over on DG, especially, are constantly asking for iris ID, and we just can't. Now if they have a list of what they purchased, and lost a tag, like Juli said, then we'll give it a shot.
But we have found in lilies (lilium) that there are re-registers from the Netherland growers. I don't thinks so intentionally in iris. So, I'm glad to hear it's not something done in daylilies.
