Delphinium x Black Knight

Black Knight Delphinium

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A tall, herbaceous perennial featuring striking dark blue flower spikes on sturdy stems. Known for its deep coloration and robust growth in cool climates.
yard Outdoor plants wb_sunny Half-shade pets Not pet-safe
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Plant Details

Common Name Black Knight Delphinium
Family Ranunculaceae
Genus Delphinium
Species X Black Knight
Variety Black Knight
Origin Europe / Asia Hybrids
Blooming Summer flowering perennial, often reblooms in autumn.
Leaf Color Grey-green to medium green
Sunlight Half-shade
Category Outdoor plants
Pet Friendly close No
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Care & Maintenance

terrain
Soil

Rich, well-drained loam with high organic matter content.

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Watering

Keep soil consistently moist but not waterlogged. Avoid wetting foliage to prevent mildew.

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Sunlight & Care

Requires full sun for best blooms; tolerates light shade in hot climates.

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Fertilization

Feed monthly during growth with balanced liquid fertilizer, stop after flowering.

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Pruning

Cut back spent flower spikes immediately; cut stems to ground level in late autumn.

Pest Control Aphid Slug Snail Spider Mite

These are the insects and pathogens that commonly interact with this plant, including pests, parasites, and organisms typically associated with its care.

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Seasonal Periods

local_florist Flowering Period 4 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
eco Leaf Persistence 10 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
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Growing Parameters

thermostat
Temperature
50° – 82°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
40% – 75%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
10000 – 60000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
2000 – 4500
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
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Soil Moisture
30% – 65%
% volumetric
Water content in the growing medium
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Soil EC
400 – 2000
mS/cm
Electrical conductivity (nutrient concentration in soil water)
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Common Problems

Something wrong with your Delphinium x Black Knight? Select a symptom to diagnose and fix the issue.

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