| Perennial
Cultivation:
There are three types of Delphiniums available. The Elatums, the
Belladonnas, and Pacific Hybrids. 'Black Knight' is in the Elatum
group which are perennial in zone 4 as are the Belladonnas.
The Pacific
hybrid group is grown as either annuals or biennials. 'Black
Knight' is a large Delphinium that may require staking while
flowering especially in windy areas.
Plant Delphinium Black Knight in full sun in
compost rich well drained soil. Delphiniums are heavy feeders and
should be feed monthly with a balanced liquid fertilizer. Plants
should be replaced every 3 to 4 years as they will become woody
and begin to decline with age. Cut plants back after initial
flowering for a possible second showing in fall. Delphinium
flowers are excellent for cutting. A fantastic choice for high
altitude gardens.
Most Delphinium varieties are poisonous.
Propagation:
Delphiniums are a bit difficult to grow from seed. Your best bet
is to purchase pre-started Delphinium plants at your local Garden Center.
Delphiniums are also difficult to divide or relocate.
Potential pests ~ diseases:
Mildews and slugs.
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