I've cut off stems that had fully mature buds and put the stem in a vase and they did open. Some the next day, others in a day or two. Typically have done this at the end of the season when frost was predicted. Congrats on your upcoming wedding.

I've never had good luck with this. By the way, there's a good reason why they are called DAYlillies.

I too have never had much luck with this cutting in advance . If I were you , I would have someone cut the newly opened scapes the day of the wedding . It will be much nicer than hoping to have blooms from previously cut scapes with a good chance that no blooms open on the scapes the day of the wedding . Note: I just edited this post as upon rereading I was thinking that perhaps you would not understand what I was trying to say . The words got in the way . .

Thanks for the thoughts. Good to know it does have a chance of working. I won't be able to cut them the day of so I will have to do it the day before. My wedding is pretty small and relaxed, so honestly I'm just going to do it regardless and see what happens. If I have to toss them all it's not a big deal. And unopened buds would look kind of cool too.

have a wonderful wedding day whatever the outcome of the daylilies !!!!

Hard to arrange when you don't know the angle of the flower, and easily bruised in arranging. I would choose another flower, if possible. Zinnias actually can make a good display, as well as dahlias. I did zinnia arrangements for an anniversary celebration, and they were a big hit with guests (but oh, so much work). With experience, you can usually tell what daylily will be open the next day, but there are always some that fool you.