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Unfortunately, not all flowers can be dried easily and, many flowers are unable to dry naturally. Don't worry, however, you can still preserve a florist delivery. To help the drying process, buy a drying agent like silica gel—you can find this in most garden or floral supply stores (it will be called assorted names). Next, read and follow the instructions in order to use the gel properly. Generally you will instructed to fill a shallow container with the silica and place the flowers over it. Then, you will continue adding the silica until the flowers are completely submerged.
In about 2 to 3 days the flowers and/or leaves should feel like paper. It's best to store the flowers in dry boxes—it also helps to put a little silica in the box as well (it helps to keep the air dry).