Depends on the size of the wedding and how many dreaded buttonholes, but usually the day before, but we prepare vases etc during the week. If its a late wedding brides bouquet done on that morning. For a saturday wedding we get the flowers on wednesday to get them conditioned. We wire leaves on the thursday and keep them in fridge for the buttonholes. Just got one for tomorrow but next friday 3 ooooooooops, and my sons 18th birthday party on the saturday, guess who will be falling asleep after 1 drink