Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
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knapweed, Squarrose<br />
Centaurea virgata, Asteraceae (Sunflower Family)<br />
Category: Prohibited Noxious<br />
• Information: Introduced from Eastern Mediterranean/Asia, looks similar<br />
to Diffuse Knapweed in growth form but has pink flowers. Weed of<br />
range and pasture, open habitats.<br />
• Life Cycle: Perennial.<br />
• Root: Taproot.<br />
• Leaves: Rosette leaves in first years growth, deeply divide leaves on the<br />
lower portion of the plant, bract-like leaves on the top, green-grey in color.<br />
• Stems: 30-50cm tall, highly branched.<br />
• Flower: Pink flowers, smaller than the other pink knapweeds, bracts below<br />
the flowers.<br />
• Seed/Fruits: Reproduces by seed, remains viable for many years.<br />
• Toxicity:<br />
• Control: Early detection, grazing.<br />
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