Hi Paul,
The discovery of the St. Julien tree was a happy synchronicity. While foraging for fruit and nuts (both to eat, and more importantly, to aquire novel genetic material for my garden) I stopped to admire an ornamental crab across the street from a plum tree I was picking. That's when I noticed a little tree that was dropping small green fruit from a couple of loaded branches.
It turns out that the owner of the house had cut down an Italian prune plum that they felt was to big for the yard. It had then regrown from the roots. She actually thought it was the same prune plum she had cut down. She didn't know what I was talking about and was surprised when I showed her the green fruits.
I believe it to be the first year fruiting but I don't know how long ago she cut the tree. When I was looking for ground fall to collect the seeds all I saw was Italian prune pits from years past!
I think it was mid September-ish when I discovered the tree. The fruits were mostly perfect at the time.