The class is performing a play of Jack and the Beanstalk. As Phoebe gets stage fright, she decides to make the props. However, there is a problem with the beanstalk: she tried to grow a real one, but it only sprouted; so she tried to build one, but it fell and broke. Naturally, Ms. Frizzle turns her into one and she becomes shorter than Liz. However, no one is sure how plants get food.