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Canada thistle is the most common thistle in New England. It is distinguished by having many small flowerheads. Canada thistle is actually native to Europe, but it was introduced to Canada first, then spread to the U.S. It is an invasive weed 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: 1-5 feet
• Flower size: flowerheads 1 inch across
• Flower color: pink to lavender
• Flowering time: July to September
• Origin: Europe