There Are Bulb Imposters Among Us What looks like a bulb may not in fact be a real bulb. It's a bulb imposter! Some of these bulb imposters may be flowering plants. Others we actually eat. One imposter goes by the name of tuber. A tuber is a short, fat, underground stem used for food storage. Can you think of some examples of tubers? See if you can discover the difference between a daffodil bulb and a potato in the next activity.