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Centaurea nigra

Family: asteraceae
Common name(s): knapweed
Hardiness ratings: USDA zone 7 - 10

General resources

• Wikipedia. Online encyclopedia entry (if defined).
• Google images. Web search for photographs.
• The Plant List. Taxonomical lookup
• Catalogue of Life. Taxonomical lookup

Links for Centaurea nigra

• Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 7-10a) (4 photos)
• Garden.org - Community-assembled plant profile (3 photos)
• Ontario Rock Garden Society - Germination information (use search on page to find this taxon)
• Rob's Plants - Plant profile with basic horticultural information and often personal observations. (2 photos)