A method to preserve flowers or a bouquet is to simply spray them with hairspray. Using this technique will keep dust off the flowers, and they also will retain some of their color for a longer time.
There are many other ways to preserve flowers as a keepsake or for crafting purposes. Some of these drying methods for flowers include pressing and air drying by hanging them upside in a dry and dark location. There also are products sold on the market for this purpose, such as desiccants, microwave kits and silicone crystals. Another option is to freeze dry flowers. This requires the services of a florist and may be expensive.