Kindness works a lot like compost. It doesn’t look like much at first, but everything around it grows. Even a little greenery can lift a whole neighborhood. In a Penn Medicine study of 541 vacant lots in Philadelphia, people living near lots that were cleaned up and planted with grass and trees reported a 41.5% drop in feelings of melancholy compared with neighbors of lots left untouched.From a $50 cucumber that was never really about the cucumber to a shelter vegetable garden grown just for the dogs, these stories show how a gardening hobby can grow kindness, and a whole lot of happiness, in the people next door.