A garden is kindness you can grow: the moment something blooms, you start looking for someone to share it with. Science says that instinct is good for us. In a University of Florida study, first-time gardeners who tended plants twice a week saw their stress and anxiety drop. From a $15 Christmas cactus with a 1931 secret to a football team weeding their coach’s vegetable garden, these stories prove the sweetest thing this hobby grows is kindness.