A part of the plant (usually underground) whose function is to act as support and anchorage, as a place of food storage and the primary organ of water and mineral absorption.

Some daylily roots are fibrous or cord-like, others very fine; some have conspicuous spindle-like thickenings (used primarily for water storage) as in ‘Europa.’

Photo by Mike Brown, used with permission

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The American Daylily Society