Celery and celery root are part of the same family of vegetables, but you may be surprised to learn that they don’t come from the same plant. Celery root is a round bulb that is approximately the size of a grapefruit, with a mild taste that is slightly sweeter than celery stalks. Where celery stalks tend to have a bright, refreshing taste, celery root is typically more earthy and intense in flavor. Also known as celeriac, celery root is a root vegetable that can be used in recipes like stews, soups, and salads, or even as a potato substitute.