Tuber

Tubers are a type of enlarged structure used as storage organs for nutrients in some plants, usually stems, but some definitions refer to roots. Tubers help plants perennate (survive winter or dry months), provide energy and nutrients, and are a means of asexual reproduction.

For fungal genus, see Tuber (fungus). For other uses, see Tuber (disambiguation).
Potatoes are sometimes called just "tubers".

Stem tubers manifest as thickened rhizomes (underground stems) or stolons (horizontal connections between organisms); examples include the potato and yam. The term root tuber describes modified lateral roots, as in sweet potatoes, cassava, and dahlias.

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