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After you have picked your edible flowers, you should wash them. Keep in mind that some edible flowers will slightly lose their color when they are washed. Flowers with long stems should be kept in water and put in a cool place. Short stem flowers can be layered between damp paper towels and placed in the refrigerater. Edible flowers will keep up to a week when handled properly and stored in a dark, cool place.
Never add a floral preservative to your flowers.