How do rhizomes help stinging nettles spread?

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red garden rose — Rosales Red garden roses (*Rosa* hybrid). Whereas wild roses have only five petals, most hybrid varieties have been bred to produce numerous petals in a wide range of colours.

Stinging nettles (Urtica dioica) spread vegetatively through the use of yellow, creeping rhizomes. These underground stems allow the plant to expand its reach horizontally, which often results in the formation of dense colonies.12