When you book your wedding venue whether it be a church or registry office, garden flowers are usually purchased to be there at your wedding. These are may be one of the most expensive things for the wedding after the dress and the cake, believe it or not the marriage license isnt that big a fee. Usually where you are getting married is covered in beautiful flowers to set the mood, although if you have it in a garden than the flowers are already there, so you dont really need to worry about that, you just have to worry about the rain!
Not only does the hall or church have to be decorated in flowers, usually the bride carries a bouquet and so do the bridesmaids and flower girls. The general tip is to get flowers that match the theme and colour of the dresses. If the theme is Christmas than red and green should be the colours that you are interested in, or if it is valentines day than red flowers. If you really want a stunning bouquets for the bride very light colours will accentuate her dress and her beauty taking very little attention of her but still giving her the elegant classy look.
Often at the reception parents are given a bunch of flowers in a presentation...