Centaurea cyanus (Cornflower, Bachelor's Button)
Botanical Information
| Family | Asteraceae |
| Genus | Centaurea |
| Species | cyanus |
| Category | Annuals, Wildflowers & Weeds |
Details
| USDA Hardiness Zone | 2 - 11 |
| USDA Hardiness Ref. | |
| Canadian Hardiness Zone | 0a - Requires cool season protection under glass. |
| Canada Hardiness Ref. | |
| RHS Hardiness Zone | H7 - H1c |
| RHS Hardiness Ref. | |
| Temperature (°C) | (-45) - 50 |
| Temperature (°F) | (-43) - 10 |
| Height | 0.3m - 0.9m |
| Spread | 0.2m - 0.6m |
| Growth | Fast |
| Flowering Period | May, June, July |
Description and Growing Information
Photographs
Scanning electron microscope images of pollen grain.