Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 94.
Sunset®: All zones
USDA: 7-10
Sun Exposure: Full sun
Origin: Europe, naturalized in much of North America in fields, borders and waste places.
Growth Habits: Biennial, 12-30 inches tall (30-75 cm) or more, many spines cover the plant.
Watering Needs: Little to moderate water
Propagation: Seeds
Poisonous.
Blooming Habits:
Showy blue flowers with purple stamens, 0.8 inch across (2 cm), June to September.
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