Just because you don’t have a yard doesn’t mean you can’t have a garden. Niche, a wee garden shop that sprouts from a subterranean storefront on Tremont Street, caters specifically to city dwellers. Indoor plants, window boxes and terrariums are specialties; they also carry necessities such as soil, mosses and rocks. And whether you’re a novice or green-thumbed, they offer design consultation services and workshops to get you growing.