Lettuce, Bok Choy, cabbage are relatively easy to grow from scraps. Instead of throwing out those leftover leaves, simply place them in a bowl with just a bit of water in the bottom. Keep the bowl somewhere that gets good sunlight and mist the leaves with water a couple of times each week. After 3 or 4 days, you will notice roots beginning to appear along with new leaves. When this happens you can transplant your lettuce or cabbage in soil.