Allium caeruleum (Blue Globe Onion or Blue Ornamental Onion)
Botanical Information
| Family | Amaryllidaceae |
| Genus | Allium |
| Species | caeruleum |
| Category | Bulbs, Perennials, Wildflowers & Weeds |
| Origin | Native to Siberia and Turkestan. |
Details
| USDA Hardiness Zone | 4a - 8b |
| USDA Hardiness Ref. | |
| Canadian Hardiness Zone | 2a - 8a |
| Canada Hardiness Ref. | |
| RHS Hardiness Zone | H4 - H7 |
| RHS Hardiness Ref. | |
| Temperature (°C) | -32 -(-7) |
| Temperature (°F) | -25 - 20 |
| Height | 30 - 60 cm |
| Spread | 15 - 30 cm |
| Growth | Fast |
| Flowering Period | May, June |
Description and Growing Information
| General Description | Garlic scented bulbous, herbaceous perennial. |
| ID Characteristic | Cylindrical basal leaves with bell-shaped flowers. |
| Landscape | Plant in tight groups for best effect. May also be used for forcing and containers. |
| Propagation | By seed or division of bulb offsets when dormant. |
| Cultivation | Best grown in fertile well-drained soil. |
| Pests | Onion white rot and downy mildew. |
| Notable Specimens | The A.M. Cuddy Gardens, Strathroy, Ontario, Canada. |
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