Inspiring (& Easy!) DIY Indoor Garden: Terrarium. You need not have a yard to cultivate something green and beautiful — you can have it all indoors with a terrarium. Just be warned: Whether you choose woodsy and tropical plants or a desert cactus, maintenance is a must. "Both require different care, lighting, and water," says Sprout Home expert Sarah Trover. "They can be made in a simple mason jar or a large handblown recycled container, depending on what your budget and space allows for."