| Scientific name | Centaurea cyanus |
| Appearance | Small dried blue flowers, in fine and slightly crumpled petals |
| Smell | Light, herbal, sweet, and subtly floral |
| Color | Azure blue to violet blue |
| Used parts | Whole flowers or dried petals (infusion, compresses, incense) |
| Origins | Europe, Western Asia, naturalized in North America |
| Toxicity level | Low (well tolerated for internal and external use; no known toxicity at traditional doses) |
