A volunteer tree appeared in my garden last year with long lace-shaped leaves (4 inches long). The mature leaves are green and the new ones have a reddish tinge. It's growing but not very quickly. At first I thought it was a peach tree, but the leaves appear to be too wide. It is growing upright. Any ideas?
What about this photo of Diervilla splendens from a Polish garden blog? Actually, I'm not sure if the leaf margins rule this out.