In article ,
gray wrote:

The normal colour is very dark, not really as the photo shows.

The stone is plum type (not a round sloe type) and is clinging.

There were a zillion local varieties of damson until fairly recently,
and all that stone demonstrates is that it is likely to be one (i.e.
a Prunus domestica of the damson type).


Regards,
Nick Maclaren.