Go Back Delphinium Black Knight Pacific Giants

Delphinium elatum 'Pacific Giants Black Knight'
Butterfly IconDeer Resistant IconHummingbird Icon

Plant Type: Perennials

Blooms all summer. Growing 4 to 5 feet in a single season with their beautiful spire-like deep blue flowers, 'Black Knight' has been a favorite of perennial gardeners for years. The Pacific Giants series are massive yet gorgeous plants with semi to fully double flowers on spikes that are 17 to 28 inches long and make excellent cut flowers. These behemoths will need staking when they begin to display their heavy flower spikes.

Currently not available for online purchase.

Growing & Maintenance Tips:

Delphiniums thrive in the cooler climates of the north country, though they will grow as far south as zone 7.  They grow best in rich, well-drained soil with a basic pH. If your soil is naturally acidic, adding lime will help to provide these conditions. They are also heavy feeders. The addition of compost or manure to the soil as well the use of granular fertilizer will result in healthier, stronger plants.

Delphiniums can be grown in full sun or partial shade, though full sun may help to prevent powdery mildew. When planting, be sure to set the crown at or above soil level to avoid rot. Since their stems are hollow, taller varieties of Delphiniums should be staked to prevent damage from wind and rain.

Flower Color

Deep violet

Foliage Color


Plant Spread

18-24 in.

Good Companions

Plant Height

48-60 in.

Scape Height

Hardness Zone


Soil Moisture

Average to moist water needs

Characteristics & Attributes


Accent, Border, Cut flower, Mass Plant, Specimen

Bloom Time

Early to mid summer

Critter Resistance


Growth Rate


Seasonal Interests