Terra Nova
Centaurea 'Snowy Owl' (36 cell half tray)
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.
This may be an odd choice for a cut flower, but in my experiments individual leaves remain stiff for at least 3 days out of water. It seems well suited for corsage and boutonniere work.
USDA Hardiness Zone(s): 9-11
Size (HT/W/FL HT): 18″ / 16″ / 20″
Exposure: Full Sun
Bloom Time(s): July, August, September, October
| US Patent # | PPAF |
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Growing Guides
Click here to access our comprehensive growing guides containing everything you need to know about this crop.
| Common Name | Centaurea, Silver-knapweed |
| Genus | Centaurea |
| Species | C. ragusina |
| Family | Asteraceae |
| Life Cycle | Annual (Perennial in zones 9-11) |
| Format | Perennial Plugs |
| Plug Care | Harden off and plant out or bump up into larger pots soon after receiving plugs. When planting out be sure you to not bury the crowns. Plant the plugs so that the top of the growing medium is level with the soil. |
| Netting / Staking | Not necessary. |
| Temperature Range | Annual outside of zones 9-11, will thrive in the summer weather of all colder zones as an annual. |
| Spacing | 14-16" |
| Soil Preference | Well drained, with a moderate organic content. Irrigate regularly but allow the soil to dry moderately between cycles. Overwatering will cause root rot. |
| Day Length | Day-neutral, plant in full sun. High light is extremely important for plant health. |
| Pinching | Do not pinch. |
| When to Plant | Plant in the spring after last frost has passed. Can be bumped up into larger pots and grown on in a heated greenhouse prior to last frost to achieve a larger size transplant. |
| Harvesting | This plant is grown for its beautiful silvery white foliage. Although not the tallest growing, the leaves hold up beautifully in floral creations and they will even withstand being completely out of water for hours without wilting. Harvest leaves close to the base of the plant when they are mature and leathery. |
| Post Harvest Care | For the longest vase life, cut stems(leaves) should be plunged into cool water and allowed to hydrate. When being used in arbors or installations they can go without water for hours and maintain hydration. |
| Diseases / Insects | No major pests or diseases to note. Bacterial leaf spot is possible in poorly draining soil or areas with high humidity and lack of airflow. |
| Bailey's Notes | Centaurea 'Snowy Owl' has not been extensively trialed as a cut foliage so we would love to hear back from growers with first hand experience. |
| Resources | Growing Centaurea |
Order Minimums and Tray Sizes
All TERRA NOVA® plugs are grown in a 36 cell half tray. The minimum order is 6 total half trays (an combination of varieties).
Orders for multiple ship weeks must be placed separately.
Patents & Plant Tags
Unauthorized propagation of varieties that are patented is strictly prohibited.
If you are purchasing these plugs with the intent to resell them, you must also purchase tags. Upon adding items to your cart, you will be prompted to add tags for each plant in the order, at the cost of $0.13 per tag. This is applied to your entire order.