The Jefferson gage was raised in Albany, New York in the 1820s and named in honour of President Jefferson. The parentage is not certain but it is possibly Coe's Golden Drop, which it resembles in appearance and flavour.
Jefferson is variously recorded as a gage or a plum, reflecting the uncertainty in nomenclature between plums and gages. We have ranked it amongst the gages primarily because it has "that" flavour which is found in gages but not plums. However it does have some plum-like characteristics, for example the growth habit of the tree is somewhat more vigorous and productive (in good conditions) than other gages. In temperate climates it is responds well to wall-training.
The flavour of Jefferson is very good. Whilst gages are traditionally considered to have a finer flavour than plums, we have a suspicion that the best flavours in the plum world are often to be found amongst the plum-like gages, a category which Jefferson probably falls into. Jefferson has the rich sweet flavour of gages but with a bit of sharpness to give the flavour some backbone. It is also very juicy, and is a very enjoyable fruit to eat fresh from the tree. The skin is a bit tough - but this is a minor criticism. A further benefit of Jefferson is that the fruits will hang on the tree for several weeks so you can pick a few each day.
All in all, Jefferson is a really excellent plum / gage variety. If you were intending to plant a few plum trees, Jefferson is definitely worth consideration.