El and Jo are the smallest students in their class--and best friends, too, like peas in a pod. Even their names are short. But in springtime, something BIG happens: Jo starts growing like a weed, while El feels smaller every day. On the last day of school, their teacher asked every child to pick a plant to care for over the summer. All the other kids reach over El to grab their plant, and she has to take the very last one: a tiny, flowerless aster. At first, she's disappointed. But as summer progresses, the aster begins to bloom--and so does El!