Is Merla's knapweed the same as ours in Britain - Centaurea scabiosa or C. nigra (also known as Hardheads ?  I have it occasionally in a rough lawn on an old cinder patch but don't find it at all invasive (it can easily be mown out).  It is, indeed, attractive and valuable as the major food-plant of cinnabar moth larvae ('football jersey' caterpillars).      Tony N-S.

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