Rhizome

In botany and dendrology, a rhizome (/ˈraɪzoʊm/ RY-zohm)[note 1] is a modified subterranean plant stem that sends out roots and shoots from its nodes.

Examples of plants that are propagated this way include hops, asparagus, ginger, irises, lily of the valley, cannas, and sympodial orchids.

Stored rhizomes are subject to bacterial and fungal infections, making them unsuitable for replanting and greatly diminishing stocks.

The ability to easily grow rhizomes from tissue cultures leads to better stocks for replanting and greater yields.

[11] The plant hormones ethylene and jasmonic acid have been found to help induce and regulate the growth of rhizomes, specifically in rhubarb.