@flicka @soaproot @l_b_i The plantNet app suggests it is purple willow, salix purpurea,
https://en.wikipedia.org/wiki/Salix_purpureaI looked through the description and it seemed to match pretty well. It's hard to tell from the picture but it looks like the leaves are almost alternate (across from each other). I don't see any hairs too and the edges of the leaves are smooth except for fine serrations towards the tip. The wiki article says it has been introduced as an ornamental garden plant too.