One of the mysteries of the English language finally explained.
A tough-stemmed Eurasian plant that typically has purple thistle-like flower heads, occurring chiefly in grassland and on roadsides.See also hardheads
- ‘The oil from the seeds of cotton thistles was extracted for fuel and knapweed, centaurea scabiosa, was believed to promote healing of bruises and wounds.’
- ‘Currently, most producers apply chemicals on rangeland in spring or summer, when knapweed begins to flower, but research is showing that fall application may be preferable.’
- ‘Spotted knapweed is not killed by fire, but sagebrush is.’
- ‘Invasive weeds such as cheatgrass and knapweeds have settled on some 125 million acres of the American West.’
- ‘In Montana, gall flies released to limit knapweed turn out to provide a food bonanza for white-footed mice.’
Late Middle English (originally as knopweed): from knop (because of its hard rounded involucre or ‘head’) + weed.
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