2. Fennel
If you’ve never tried regrowing fennel, it’s easier than you’d expect. After cutting the bulb, save the base and place it in a shallow bowl of water. Make sure the root end sits in water and gets plenty of sunlight. In less than a week, you’ll see green shoots sprouting from the center. Once roots develop, transfer it to a pot with soil. You won’t regrow the full bulb quickly, but the leaves are great for cooking.