The best way to produce fertile soil in your back yard is with a garden composter. These outdoor units can produce valuable compost from things you pick up around your yard. Capacities vary, with units that can hold up to 11 cubic feet of compost to much larger models that can house more than 60 cubic feet of compost. Also consider other types of composters, such as a compost tumbler, compost bin, worm composter, kitchen composter and even products like compost tea.