Damson is a plum variety that's found throughout Europe, but the name is most commonly applied to varieties that are native to the United Kingdom. The plums are small to medium in size, with an ovoid shape. The flavor is distinctive, rich, sweet, and slightly astringent when fully ripe.
The skin ranges from dark blue to indigo and near-black in color. This type of fruit is considered to be of the clingstone type, meaning that the flesh sticks to the stone in the center. Damsons are harvested from late August to September or October and they're mostly used for cooking and making jam or fruit preserves.