knapweed

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Related to common knapweed: greater knapweed

knapweed

any of several plants of the genus Centaurea, having purplish thistle-like flowers: family Asteraceae (composites)
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They include the native bluebell, common knapweed, pigmeat, meadow cranesbill and birdsfoot trefoil.
Wildflower seeding will include foxglove, red campion, rough hawkbit, common knapweed and dog violet.