Podcast:But Why: A Podcast for Curious Kids Published On: Fri Mar 17 2017 Description: Why are there so many plants? How are seeds made? How does germination work? How can plants grow so big if they start from such a small seed? Why are flowers different colors? Why are plants and trees green? Where does dirt come from? In this episode of But Why , we're talking about plants with garden consultant Charlie Nardozzi.