A tuberous root is an enlarged fleshy root modified as a storage organ with shoots produced at one end and roots produced at the other.
Sweet potato is produced from a tuberous root.
Botanically, tuberous roots differ from true tubers because tubers are modified stem tissue.
Tuberous roots are produced in a number of herbaceous perennials.
Propagation is by crown division and can be performed on the dormant or in some cases, actively growing plants.
Each crown division should have several buds or "eyes" and sufficient storage root to make a new plant.
Species propagated division of the tuberous roots include:
Dahlia, Ranunculus, daylily (Hemerocallis), some Iris species, and peony (Paeonia).
Peony are propagated by division of the tuberous roots. Plants are dug with modified potato diggers while they are dormant.
Field dug peony plants are washed to remove soil prior to division.
Tuberous roots are divided to reduce the root size to fit into packaging or containers. Each division has several crown buds or eyes.