finished crown in a refrigerator (as long as it's not TOO cold and there aren't lots of fruits and vegetables to off-gas and wilt your flowers or turn them brown) will definitely help it to stay pretty, as will spritzing the crown with cool water a little while before you plan to wear the crown. Greenery, such as rosemary, bay laurel, or certain types of ivy will last a fair while and look good without needing water or refrigeration. Of course, you can always use silk flowers/greenery from a craft store, or make paper flowers to turn into a crown. I'm just partial to the fresh stuff. :) Awesome. I was a June hippie bride and I made my own flower crown about an hour before the ceremony, using flowers from my mom's garden (a.k.a. the venue). Two days beforehand, I picked a little bouquet and put it in a vase without water to find out which flowers kept best. Bachelor's button was the clear winner, and I used a lot of that, plus lavender, clover, poppy pods (but not the poppies themselves, which don't survive long after being cut even WITH water), and a few big roses for oomph. I learned how to make flower crowns while I was living on a hippie organic farm, and the technique I use doesn't call for anything except flowers and a little patience. I've been wanting to write up a little how-to... maybe this will be the kick I need! Another cute