Diffuse Knapweed comes to us from Asia Minor and southern Russia. It can be found throughout Oregon and Idaho as a biennial.
During the plant’s first year, a deep tap root with broad leaves is produced. In the following year, it will grow a single stem that will branch with a flower bulb at the end. The plant will typically grow one to two feet tall. The bulb will blossom into a purple head, a half inch in diameter with spearhead-shaped seeds.
Diffuse Knapweed is nearly drought tolerant, establishing feverishly in overgrazed upland range sites. It is also common on roadsides. Biological controls are effective—high intensity grazing is recommended.
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