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Spotted knapweed is one of four species of lavender-flowered knapweeds that grow in Connecticut (none of them native). Spotted knapweed is the most common; it can be distinguished by its deeply cut leaves and its wiry, much-branched stems. Spotted knapweed is an invasive plant that threatens native plant habitats. More on this topic from Invasive Plant Atlas of New England.

• Family: Aster (Asteraceae)
• Habitat: fields, roadsides, waste places
• Height: 2-3 feet
• Flower size: flowerheads 1 inch across
• Flower color: lavender
• Flowering time: June to August
• Origin: Europe