A Rose hip is the fruit of a rose. The wild dog rose is the type of rose most often cultivated for their hips. This plant grows up to ten feet tall and bears a white, very fragrant flower. Once the flower has bloomed, and all the petals have fallen off, the hip is picked and used in a wide variety of preparations. Rose hips are the best source of vitamin C; they contain 50% more vitamin C than oranges. A single tablespoon of the pulp gives an adult more than the recommended daily allowance of 60 mg. They can be eaten raw, after being put through a blender, or soaked in water overnight and then cooked in the water for about half an hour. Because of the high vitamin C content they are an excellent immune system booster, and are often used as a supplement to prevent or treat a cold. The pulp from rose hips may be used in sauces or made into jelly.