black knapweed


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Related to black knapweed: greater knapweed
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Noun1.black knapweed - a weedy perennial with tough wiry stems and purple flowersblack knapweed - a weedy perennial with tough wiry stems and purple flowers; native to Europe but widely naturalized
knapweed - any of various plants of the genus Centaurea having purple thistlelike flowers
References in periodicals archive ?
It is home to rare plants including meadow foxtail, greater bird's-foot-trefoil, red clover, black knapweed, ox-eye daisy and cocksfoot.
In 2003, the People's Trust for Endangered Species bought the abandoned Rough Hill Orchard, located beside the River Avon in Worcestershire, and have since discovered 110 plant species, including agrimony, black knapweed, wild carrot, quaking grass, slender trefoil and the rare great dodder.
Oxeye daisy and black knapweed grow in the wildflower areas and you can find greater burnet, ragged robin and yellow rattle in the meadow.