Branches by Brigid Martin:
Lynn is a librarian. She loves her job, she’s got problem-solving skills, she can find any book in her library. She is perfectly content with where she is in life. She likes helping people. She can tell you plenty of things about herself. Jasper, on the other hand, can tell you one: they’re turning into a tree. With a little bit of magic and a whole lot of facts about trees, Branches is a story about finding a place to grow roots and being brave enough to stay.