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How did burdock seed heads inspire the invention of Velcro?

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Sunflower — Asteraceae The flowering head of a sunflower (*Helianthus annuus*) is formed of yellow, petal-like ray flowers and a brown center of minute disk flowers.

The invention of Velcro was inspired by the burdock plant, a member of the Asteraceae family. While some accounts mention cockleburs, the mechanism remains the same: the plant’s fruit forms round, prickly burrs featuring distinctive hooked bracts that easily cling to clothing and animal fur.123

In 1941, Swiss engineer Georges de Mestral observed these burrs sticking to his clothes during a hunting trip. He realized that the tiny hooks on the burrs could latch onto the loops of fabric, a discovery that led to the development of the hook-and-loop fastener known as Velcro. The name itself is a portmanteau of the French words velours (velvet) and crochet (hooks). This invention is a classic example of biomimicry, where natural biological designs are imitated to create functional engineering solutions.13