Corkscrew hazel - catkins appearing
When I arrived, there were already undeveloped catkins on the tree, but of course there were no leaves at all. Today, they are already showing before the leaves have fallen. Since they are already quite large, they must have been developing for a little while already.
This is quite suprising to me, as they finally opened out in March this year so it seems that they spend around six months in the undeveloped form over winter.