A plum is a sweetfruit. Its scientific name is Prunus. When dried, it is called a prune. The color "plum" takes its name from the fruit. Plum colored plums are called purple plums and are a deep purple color; other plums are reddish purple (these two varieties are shown in the picture at right). Some other plums can be yellow, red, green or even white. The fruit has a groove running down one side, and a smooth stone (seed). The flesh of the fruit is brownish and is very juicy. The skin can be eaten. It can also be used to make jam and the juice can be used to make wine. It is closely related to the apricot.
There are many cultivars of 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. These are some of the best-kown:
Damson (purple or black skin, green flesh, clingstone, astringent)
Greengage (firm, green flesh and skin even when ripe)
Yellowgage or golden plum (similar to greengage, but yellow)
Victoria plum (yellow flesh with a red or mottled skin)