The illustrations a re bright and cheerful and inviting.  The book begins with note Tu B’Shevat as a Jewish holiday, describing some of the customs there of, and comparing it to Arbor Day.  The story tells of Joni and her friend, Nate trying to figure out what to do for Joni’s tree to celebrate its birthday.  In the end it comes down to making a promise to always be good to the trees of the world.  A good book for making an environmental care-taking point, but a bit pedantic as a story.