dahlia root tubers

A tuber is a swollen underground stems or roots which are organs of perennation and vegetative propagation and contain stored food material. The potato is a stem tuber. It swells at the tip of a slender underground stem (or stolon) and gives rise to a new plant the following year. In stem tubers new plants develop from the buds, or eyes, growing in the axils of the scale leaves. Tubers are propagated by sections containing at least one eye. Dahlia tubers are swollen roots. In the wild, tubers enable the plant to survive an adverse season(winter or dry season). See also food storage in plants.