the number of plants which do as you describe are few and far between, and you're unlikely to be planting them in a cultivated garden in the UK, with the possible exception of walnut. The flowers on any plant last as long as the local conditions, and the plant, will allow - if its very dry, they'll keel over quicker, if its really wet, they may ball up in the rain, etc.

as bamboo sais its rare to get flowers like that . realy its up to personal taste and how long you want colour in your garden .