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Gladiolus Black Surprise
filter_vintage Iridaceae Plants yard Outdoor plants

Gladiolus Black Surprise

Black Surprise Gladiolus

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A striking cormous perennial featuring tall spikes of deep burgundy-black blooms with white margins. Requires full sun and well-draining soil, primarily grown as a seasonal garden bulb.
yard Outdoor plants wb_sunny Sun pets Not pet-safe
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Plant Details

Common Name Black Surprise Gladiolus
Family Iridaceae
Genus Gladiolus
Species Grandiflorus
Variety Black Surprise
Origin Cultivated Hybrid
Blooming Summer to early autumn, tall spikes of flowers.
Leaf Color Grass-like green
Sunlight Sun
Category Outdoor plants
Pet Friendly close No
yard

Care & Maintenance

terrain
Soil

Well-draining sandy loam, rich in organic matter and pH 6.0-7.0

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Watering

Regular watering during active growth; reduce after flowering to allow corm maturation; keep dry during dormancy

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Sunlight & Care

Full sun required for best flowering (minimum 6 hours daily)

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Fertilization

Apply balanced bulb fertilizer at planting and mid-season feeding

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Pruning

Cut spent flower spikes; leave foliage until yellowed for energy storage; lift corms in cold climates

Pest Control Aphid Bulb Mite Thrip

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
agriculture Harvesting Period 2 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
eco Leaf Persistence 9 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
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Growing Parameters

thermostat
Temperature
50° – 90°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
40% – 70%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
1500 – 35000
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
25% – 65%
% volumetric
Water content in the growing medium
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Soil EC
300 – 1800
mS/cm
Electrical conductivity (nutrient concentration in soil water)

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