I have spent a lot of time lately thinking along the same lines, but I keep running into so many obstacles, I can't figure out how it could, or should be done. It has to be kept very simple, limited only to the most wanted data. It has to be kept private, I think many people don't post what they grow, because they don't want to be pestered by plant requests. That is one of the reasons I think we don't see more comments in the database, but that limits the credibility of the info. I think the goal is to gather zone based info from all gardens and zones instead of just in the hybridizers garden, how to do that eludes me.
I do like the idea of a featured daylily of the week, just for a trail to see how many people would respond with comments.
Oh yes, it would have to be limited to just factual info, all other discussion would have to take place in a separately started thread! But photos to instrate would be allowed.