Trachelium caeruleum

Blue Throatwort

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Mediterranean perennial herb with tubular blue-violet flowers on hairy stems. Popular cut flower preferring cool summers, full sun and well-drained soil conditions.
yard Outdoor plants wb_sunny Half-shade / Sun pets Pet Friendly
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Plant Details

Common Name Blue Throatwort
Family Campanulaceae
Genus Trachelium
Species Caeruleum
Origin Southern Europe / Mediterranean Basin
Blooming Summer to early autumn
Leaf Color Grey-green / Green
Sunlight Half-shade / Sun
Category Outdoor plants
Pet Friendly check Yes
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Care & Maintenance

terrain
Soil

Well-drained fertile loam or sandy soil; avoid waterlogging

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Watering

Moderate watering during growth, allow surface to dry between sessions. Reduce significantly in winter dormancy.

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Sunlight & Care

Full sun to partial shade; protects from scorching midday heat in hot climates

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Fertilization

Apply balanced liquid fertilizer monthly during active growing season (Spring/Summer)

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Pruning

Deadhead spent flowers to encourage reblooming; cut back foliage after flowering cycle ends

Pest Control Aphid Slug Snail

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 5 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
41° – 86°
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)
3000 – 50000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
800 – 2500
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
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Soil Moisture
20% – 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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