With the resurgence in interest in plums, growers have increasingly tried to improve on the popular English Victoria plum, and Excalibur is one of the best examples of these improved Victorias. The plums are larger than Victoria, and arguably have a better flavor for eating fresh.
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Unlike Victoria, Excalibur is not self-fertile - it needs a pollination partner, but Victoria is compatible. Cropping is lighter than Victoria (which is no bad thing) but still productive, and Excalibur has better disease resistance.
Excalibur was developed by R. Jones in the UK and released in 1989. The mother variety is Count Althann's gage, noted for its superb flavour.
The same breeding programme also led to another popular garden plum variety called Avalon.