If you cook at all, you’re probably familiar with the internal structures of an onion. Guess what? Onions are what’s known as true bulbs Tulips are also true bulbs. A true bulb has layers of fleshy tissue that act as the food storage organ. Roots form at the base of the bulb and serve to anchor the bulb in soil and absorb water and nutrients. When you buy bulbs, you’ll often see dried root remnants at the base of the bulb. Examples of true bulbs: onion, garlic, allium, daffodil, tulip, amaryllis, grape hyacinth, Dutch hyacinth, Dutch iris, scilla, lily.