Especially during the winter, I love to grow indoor plants from my leftover veggies when we cook. Lettuce and onions are fast-growing. If you are patient, place toothpicks in an avocado seed over water and wait. Wait. Wait. Eventually, months later, you will have a small tree. I have cut lettuce off regrowth before just for a mini snack. Potato eyes work well to root in dirt. The flowers on both the potato and onion are lovely. So, the next time you cook, think about putting that carrot top in water. A superb green leaf bursts out.