Tuberous Root: A True Root for Nutrient Storage

While other bulb types are specialized stems, a tuberous root is a true root, thickened to store nutrients. Fibrous roots for water and nutrient uptake grow from its sides and tip. Tuberous roots grow in a cluster, with swollen portions radiating from a central point. Growth buds are at bases of old stems rather than on roots themselves. Dahlia and daylily (Hemerocallis) are well-known examples.

If it has a growth bud, an individual tuberous root can give rise to a separate new plant.