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As far as I know, farmers are fine with knapweed.

In time, up came indigenous plants like knapweed and yellow rattle and more exotic blooms like Camassia, byzantine gladiolus.

Working Dogs for Conservation has trained dogs to find spotted knapweed in Montana, Chinese bush clover in Iowa, yellow star thistle in Colorado, rosy wolf snails in Hawaii and brown tree snakes in Guam.

These include tufted vetch, bugle, tormentil, red clover, lady's bedstraw, white campion and greater knapweed.

The scarves are emblazoned with botanical prints based on plants like white oxeye daisy, purple spotted knapweed and yellow toadflax.