Patrice, the Dave's Garden website includes patent information in their database listings. You have to be a paid member to get in the database, though. I use it only for the ones that are labeled as patented and not patented, there. If there's no info on patent, I don't take that as a "no patent" bc perhaps it hasn't been posted there yet, so I put a question mark in my daylily patent column, in those instances. But as mentioned above, not many DL's are actually patented.
IMHO it seems that at least the AHS should have patent information.
