| Common Name | Silver-Knapweed |
|---|---|
| Family | Asteraceae |
| Genus | Centaurea |
| species | ragusina |
| Plant Type | Annual |
| US Patent # | PPAF |
| EU Grant # | PBRAF |
| Bloom Time | July, August, September, October |
| Flower Color | Yellow |
| Foliage Color | Green, Silver |
| Dormancy | -- |
| Exposure | Full Sun |
| Growth Habit | Upright |
| Growth Rate | Moderate |
| Hardiness Zone | 9, 10, 11 |
| How Different? | -- |
| Landscape Value | Use in potted containers, mass plantings, edging or summer borders. |
| Most Active Growing Season | Summer |
| Persistence | Annual |
| Size (HT/W/FL HT) | 18" / 16" / 20" |
| Soil (Garden) | Well drained with a moderate organic content. |
| Water (Garden) | Average |
| Special Uses | -- |
| Comments | -- |
Centaurea ‘Snowy Owl’
2020 – Best New Variety Winner at the Colorado State University Flower Trial Garden. Large, velvety, white leaves contrast beautifully in mixed containers and summer borders. This tough annual loves full sun and grows into a well-branched, cushiony mound.
USDA Hardiness Zone(s): 9-11
Size (HT/W/FL HT): 18″ / 16″ / 20″
Exposure: Full Sun
Bloom Time(s): July, August, September, October
| Water (Greenhouse) | Dry moderatley between waterings. |
| EC | 1.0- 1.5 |
| pH | 5.5 – 7.0 |
| Fertility Needs | 150 – 200 ppm |
| Notes | High light important to maintain plant health. Do not overwater. |
| Finish Time to 4″ | 6 – 8 weeks |
| Finish Time to Gallon | 10 – 12 weeks |
| Day Length for Flowering | — |
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Photo(s) courtesy of TERRA NOVA® Nurseries, Inc.
www.terranovanurseries.com
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