Last Friday April 29 was the official Arbor Day but everyday can be Arbor Day! Arborday.org website has a plethora of info and resources. Their Tree Guide offers details on commonly planted landscape trees. Check out your hardiness zone according to zip code. Be sure to check out the plant the right tree diagrams and quizzes to learn where you should plant a tree or try the Best Tree Finder Wizard. Their forums allows posting of questions, sharing advice and stories or building networks of people.
Libraries can use this resource when tree planting around their library and especially to share with their patrons! And its always a nice gift to give to tree.