If you have a green thumb but minimal garden space, why not create your own mini-world full of lush and beautiful plants by making your own terrarium? If you’re in the southern hemisphere instead, remember that having green plants around is a surefire way to keep away the winter blues, plus plants are certain to help improve your indoor air quality. Terrariums are easy-to-make, low-maintenance gardens, and can last almost indefinitely with minimal water.