Tilly has been learning all about trees and she would love to grow one. So when Grandma shows Tilly her special oak tree and they collect an acorn from the ground, they know just what to do. With help from their friends Worm and Ladybird, Tilly starts to grow her very own oak tree. Join in as she watches it grow, with fun flaps to lift to see what's happening underground and a big pop-up surprise at the end.