If you're a city-dweller living in a small apartment, you probably don't compost food scraps. Even with a countertop composter, most of us don't have easy access to a place to put the compost—so it might still end up in the trash (unless you live in a city with mandatory composting). But if you happen to have a balcony, there's another option. A simple system from a Dutch designer combines a small vertical garden with a tube for composting, so you can feed kitchen scraps directly to your garden. The garden can grow 20 plants in just inches of floor space.