There are three major sources of fresh flowers for retail florists in North America: local growers, local wholesalers and flower auctions. Miami is considered to be the main distribution point for imported fresh flowers. Many local wholesalers are purchasing fresh flower stock from importers in Miami to resale to local florist in their areas. Wholesale flower districts present in many North American cities such as New York, Boston and San Francisco. Flower auctions are run using Dutch clock system and mainly located in Canada: Toronto, Montreal, and Vancouver. Internationally there are hundreds of wholesale flower markets and auctions, the largest of which is located in Aalsmeer, Holland, the Bloemenveiling Aalsmeer. Other major markets include the fledgling Dubai Flower Centre and the Ota Flower Market in Tokyo, Japan.
Generally, a florist's shop will contain a large array of flowers, sometimes displayed on the street, or will have a large plate glass window to display the flowers. To keep them fresh, the flowers will be inside of a cooler and kept in water, generally in glass or plastic vases or other containers. Most shops have a cooler near the front of the store with large glass doors so that customers can easily view the contents. Some shops also have another cooler out of the customers' view where they keep extra stock and arrangements for customers' orders. Most stores have a back section in which the designers can work on orders with more privacy.
Source : http://en.wikipedia.org/wiki/Florist
See Also : Sydney Florist, Melbourne Florist, Brisbane Florist