Grow your own fruits and vegetables from nothing but kitchen scraps Rather than throwing away leftover seeds and cuttings from food in your kitchen use them to grow more. Learn how to turn a single sweet potato into a pot full of them. Grow a salad from the end bit of lettuce and a lemon tree from a single seed. Several of these projects require nothing more than a jar a windowsill and a few pieces of food that would otherwise end up in the trash or compost.