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Botanical name: Delphinium ‘Black Knight’
Low mounds of dark green foliage produce tall sturdy stems covered in semi-double royal blue flowers; blooms from early to mid summer; a great addition to borders, beds or patio containers; lovely grouped together in fresh-cut bouquets.
Other names: Candle Larkspur, Pacific Hybrid Larkspur
| Hardiness zone | 2a |
|---|---|
| Flower color | royal blue |
| Foliage type | deciduous * |
| Plant form | towering |
| Mature height | 3 feet (5 feet with the flowers) |
| Spread | 18 inches |
| Light requirements | full sun |
| Moisture requirements | average to moist |
| Plant origin | hybrid |
* deciduous = loses leaves in winter
Pacific Giant Black Knight Larkspur features bold spikes of royal blue flowers with indigo eyes rising above the foliage from early to mid summer. The flowers are excellent for cutting. Its deeply cut lobed leaves remain forest green in color throughout the season. The fruit is not ornamentally significant.
Pacific Giant Black Knight Larkspur is an herbaceous perennial with a rigidly upright and towering form. Its relatively fine texture sets it apart from other garden plants with less refined foliage.
This plant will require occasional maintenance and upkeep, and should be cut back in late fall in preparation for winter. It is a good choice for attracting bees, butterflies and hummingbirds to your yard. Gardeners should be aware of the following characteristic(s) that may warrant special consideration;
Insects, Disease
Pacific Giant Black Knight Larkspur is recommended for the following landscape applications;
Vertical Accent, Mass Planting, General Garden Use, Container Planting
Pacific Giant Black Knight Larkspur will grow to be about 3 feet tall at maturity extending to 5 feet tall with the flowers, with a spread of 18 inches. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 12 inches apart. It tends to be leggy, with a typical clearance of 1 foot from the ground, and should be underplanted with lower-growing perennials. The flower stalks can be weak and so it may require staking in exposed sites or excessively rich soils. It grows at a medium rate, and under ideal conditions can be expected to live for approximately 10 years.
This plant should only be grown in full sunlight. It prefers to grow in average to moist conditions, and shouldn't be allowed to dry out. It is not particular as to soil type or pH. It is somewhat tolerant of urban pollution. This particular variety is an interspecific hybrid. It can be propagated by division; however, as a cultivated variety, be aware that it may be subject to certain restrictions or prohibitions on propagation.
Pacific Giant Black Knight Larkspur is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. With its upright habit of growth, it is best suited for use as a 'thriller' in the 'spiller-thriller-filler' container combination; plant it near the center of the pot, surrounded by smaller plants and those that spill over the edges. It is even sizeable enough that it can be grown alone in a suitable container. Note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden.
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