quite often buy bouvardia and don't really give it any special treatment. Don't use the special food, although i know it would probably last longer if i did, but stands easily for a week and more so long as it's good when you buy it. Leave it too long to get a full show of colour and there is a danger that some of the buds will collapse, so i'd tend to use it on the 'safe' side of openness. As soon as you see one of the heads dropping, you haven't got that much time left for wedding quality work.