In this Franklin TV Storybook, it's Earth Day and Mr. Heron is giving away free trees. Franklin can hardly wait to plant a big climbing tree in his backyard. But when Franklin gets to the village square, Mr. Heron hands him a tiny sapling. Disappointed, Franklin doesn't notice when the little tree falls off his wagon. On his search for the lost tree, Franklin discovers that even the very biggest trees in the village started out as something small.