Jay

Pete, looking at the leaves and the full tree and hearing that it has small little flowers I have a thought. You live in an area not that different than mine, Zone 5b/6a... I have a purple leaf plum in my front yard. The tree looks very much like yours. The flowers are very small pink to white in color and the leaves although not exactly the same are very similar. I would look in this direction.

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A Bonsai student living with his trees at N 44.37 W 77.49...
Think before you act... then think again... no good comes from rushing