17. Lettuce
Lettuce is quick to regrow and perfect for small kitchens. After using the leafy part, save the bottom of the head and place it in a shallow bowl with a little water. Keep the bowl near sunlight and change the water regularly. New leaves will begin to grow from the center in just a few days. Once roots form, you can move the base into soil for fuller growth. This method works with romaine, butterhead, and other varieties.