Blue's Clues Season 4 Episode 21 Let's Plant Episode Title:Let's Plant.Episode Description: We join Steve and Blue who are outside planting Nero, a new plant of theirs. In this episode, we learn all about plants, starting with some of the plants in the backyard of the Blue's Clues house. We help Periwinkle learn about plants and pretend to be plants ourselves. Later, we skidoo into a plant book and learn about the very smart behaviors of some of Blue's favorite plants, such as the Venus Flytrap.