These users are new and they may be a little lost.
Help them with a welcome message, sending them a friend request or even offering them a tree.
These users are planting machines!
They are helping our planet at full speed. Why not leaving a comment in one of their trees to show your support?
These users planted many trees for their friends and contacts.
To congratulate, just to say hi or show you care... Any occasion is good to offer a tree for a friend. Try it ;-)