Bob and the team are building a hothouse in Bobland Bay for tropical plants. It's a big job and will require lots of concentration. Lofty asks Mr. Beasley if he can take care of the banana tree until the hothouse is finished but looking after a tropical plant is hard work. Lofty refuses help from plant expert Flex because he wants the banana tree to be his special friend and ends up rushing back and forth between the build and the banana tree. In his rush Lofty smashes all the glass panels needed to house the tropical plants. Bob explains that if you want to be a plant's friend, you should do what's best for it. Mr. Bentley is designing the new botanical garden. Roley thinks a flat garden would look beautiful. Mr. Bentley agrees and goes off to tell Bob and the rest of the team while Roley excitedly gets to work. However, when Mr. Bentley speaks to Bob he learns that the plants will all need different things and that a flat garden just won't do. They race to tell Roley but - too late - he has flattened the whole field. They have to start all over again!