| Description | A group of very large plants with giant inflorescence of blue flowers. |
|---|---|
| Plant Type | All Plants, Biennials |
| Hardiness Zone | 9-10 |
| Sunlight | full |
| Moisture | average, low water requirements |
| Soil & Site | well drained |
| Temperature | tolerates occasional temperatures down to 25 degrees F, may die from successive low temperatures |
| Flowers | sky blue to rose colored in a scorpiod cyme (cyme with flowers or branches alternating in opposite ranks) |
| Leaves | rosette silver-green lanceolate leaves |
| Dimensions | 8-10 plus feet tall in warmer climates |
| Propagation | two years from seed to produce a flowering plant, reported to be easy to germinate |
| Native Site | Native to the Canary Islands. |
| Author's Notes | It would be a bit of a challenge to grow "The Tower of Jewel" true to form in hardiness zone #5. Being a biennial it would take two years and it is a large plant. May well be worth the effort to add a very exotic element to the garden. They were impressive plants at the Chicago Botanic Garden. |
| Notes & Reference | #51-Armitage's Manual of Annuals, Biennials, and Half-Hardy Perennials (Alan Arimitage) ,#109-Annuals and Tender Perennials for North American Gardens (Wayne Winterrowd) |
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