Cited from en.wikipedia.org:
Cultivation and Uses
Plum fruit tastes sweet and/or tart; the skin may be particularly tart. It is juicy and can be eaten fresh or used in jam-making or other recipes. Plum juice can be fermented into plum wine; when distilled, this produces a brandy known in Eastern Europe as Slivovitz, Rakia, Ţuică or Pálinka. In central England, a cider-like alcoholic beverage known as plum jerkum is made from plums.
Dried plums (or prunes) are also sweet and juicy and contain several antioxidants. Plums and prunes are known for their laxative effect. This effect has been attributed to various compounds present in the fruits, such as dietary fiber, sorbitol, and isatin. Prunes and prune juice are often used to help regulate the functioning of the digestive system. Dried prune marketers in the United States have, in recent years, begun marketing their product as "dried plums". This is due to "prune" having negative connotations connected with elderly people suffering from constipation.
Dried, salted plums are used as a snack, sometimes known as saladito or salao. Various flavors of dried plum are available at Chinese grocers and specialty stores worldwide. They tend to be much drier than the standard prune. Cream, ginsing, spicy, and salty are among the common varieties. Licorice is generally used to intensify the flavor of these plums and is used to make salty plum drinks and toppings for shaved ice or baobing.
Pickled plums are another type of preserve available in Asia and international specialty stores. The Japanese variety, called umeboshi, is often used for rice balls, called onigiri or omusubi. The ume, from which umeboshi are made, is more closely related, however, to the apricot than to the plum.
As with many other members of the rose family, plum seeds contain cyanogenic glycosides, including amygdalin. These substances are capable of decomposing into a sugar molecule and hydrogen cyanide gas. While plum seeds are not the most toxic within the rose family (the bitter almond is the most toxic), large doses of these chemicals from any source are hazardous to human health.
Prune kernel oil is made from the fleshy inner part of the pit of the plum.
Plums come in a wide variety of colors and sizes. Some are much firmer-fleshed than others, and some have yellow, white, green or red flesh, with equally varying skin color.
The plum blossom or meihua (Chinese: 梅花; pinyin: méihuā), along with the peony, are considered traditional floral emblems of China.
The plum is commonly used in China, Yunnan area, to produce a local plum wine with a smooth, sweet, fruity taste and approximately 12% alcohol by volume.