Casimir did you grow those plums? What can you you tell us about how you grew them? Or where did you find them?
--where do you live approximately
--did you plant the original tree, is this a rootstock that was allowed to grow, how many years did the St Julien take to bear fruit?
--when did they bloom especially compared to your other trees, did you have another European plum as a pollinator?
--when was the harvest, at what point was the flavor best?
etc
I have a tree with a failed scion and I am probably going to try growing out the St Julien rootstock but as you say it's hard to find information, hoping you have some info from your own experience or whoever grew those
