they'll prolly have to bring them with them and after that, it's a closed loop system with EVERYTHING recycled, everything... with minimum replenishment from earth of what finally breaks down is my guess they'll prolly have to bring them with them and after that, it's a closed loop system with EVERYTHING recycled, everything... with minimum replenishment from earth of what finally breaks down is my guess that sounds to me like a window box...your soil, your nutrients, your water and EUREKA plants bloom....brilliant