Click on this link http://looseandleafy.blogspot.ca/p/what-is-tree-following-and-list-of-tree.html. Read to the bottom of the instructions and you will see you do not need a blog to join in, just email the administrator.
Here are a few pictures from the site
|birds on silver birch|
|moss on bramley apple tree|
|female flower-hazel tree|