Valerie of Research Services recommends The Language of Flowers by Vanessa Diffenbaugh:
It is said that non-verbal communication can be just as, if not more powerful than, what is spoken aloud. Victoria Jones is a mistrustful soul who has been shuffled from one foster home to another, and has even endured homelessness. It is at age ten, when she is placed with Elizabeth, that she finds solace in flowers and their meanings. Later, Victoria has an uncanny ability to convey messages through the bouquets she creates, and builds a future on this skill…but a catastrophic secret from her childhood is nearly enough to jeopardize her one chance at happiness. Can this self-described “thistle-peony-basil kind of girl” overcome her past and learn the true meaning of love? Just as receiving a bouquet of flowers creates a pleasant memory, so too will this story of faith and redemption.