Help with my oak?
Can anyone offer any advice on the oak (I believe it's a swamp oak?) pictured below:
The tree has small round "nodes" on the branches approximately the size of a marble (see below). I have knocked them off in past years but they always seem to grow back. I'm not sure if they are hurting the tree or not.
Also, the tree is a parkway tree and was supplied by the city. A couple of years ago the tree had a branch that was damaged in a storm and I pruned the tree down during the following winter to improve its shape. Does it seem to be shaped properly? Is there anything else I should do besides stake it for straightness to improve it's health/appearance?
Thanks in advance!