Gladiolus Black Star

Black Star Gladiolus

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Gladiolus 'Black Star' is a striking cormous perennial featuring tall spikes of deep burgundy-black flowers with contrasting white throats. Thrives in full sun, ideal for borders and cut flower arrangements.
yard Outdoor plants wb_sunny Sun pets Not pet-safe
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Plant Details

Common Name Black Star Gladiolus
Family Iridaceae
Genus Gladiolus
Species Hybrid
Variety Black Star
Origin South Africa / Cultivated Hybrid
Blooming Late summer to early autumn flowering spikes
Leaf Color Green
Sunlight Sun
Category Outdoor plants
Pet Friendly close No
yard

Care & Maintenance

terrain
Soil

Well-draining sandy loam enriched with organic matter and compost

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Watering

Regular watering during active growth phase, reduce significantly after blooming to allow corms to dry out before dormancy

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Sunlight & Care

Requires full sun exposure (minimum 6 hours daily) for optimal flowering and spike height

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Fertilization

Apply balanced fertilizer at planting and high-potassium feed when flower buds appear

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Pruning

Cut spent flowers immediately to prevent seed formation; allow foliage to yellow naturally for nutrient return to corm

Pest Control Aphid Slug Snail 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
eco Leaf Persistence 12 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
thermostat

Growing Parameters

thermostat
Temperature
54° – 95°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
40% – 80%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
3000 – 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
water
Soil Moisture
30% – 70%
% volumetric
Water content in the growing medium
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Soil EC
400 – 2500
mS/cm
Electrical conductivity (nutrient concentration in soil water)

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