... on our mop top tree (robinia) early one morning after rain during the night. I've not noticed the water beading so much on leaves before. Maybe I was just concious of it because my husband polished my car last week and the water beaded nicely on it during the rain.
It didn't last long, but looked first up like the tree had been dusted with snow or icing sugar. It was only close up that the water spots became obvious.