Lobelia siphilitica

Great Blue Lobelia

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A hardy North American perennial with tall spikes of vibrant blue flowers, thriving in wet soils and stream banks during late summer.
yard Outdoor plants wb_sunny Half-shade / Sun pets Not pet-safe
info Pot sizes shown are estimations. Real dimensions may vary depending on the merchant.
Merchant Pot Size Availability Price
Amazon.com 7-8 in Out of Stock - Buy
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Plant Details

Common Name Great Blue Lobelia
Family Campanulaceae
Genus Lobelia
Species Siphilitica
Origin North America
Blooming Tall spikes of blue flowers in late summer, attracts pollinators
Leaf Color Green
Sunlight Half-shade / Sun
Category Outdoor plants
Pet Friendly close No
yard

Care & Maintenance

terrain
Soil

Moist, rich, boggy soil or heavy clay; tolerates wet feet

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Watering

Keep soil consistently moist, does not tolerate drought conditions

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Sunlight & Care

Full sun to partial shade; requires consistent moisture

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Fertilization

Minimal fertilization needed in fertile soils, apply compost annually

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Pruning

Deadhead spent flowers to encourage more blooms and prevent self-seeding

Pest Control Aphid Leafhopper Slug

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 3 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
eco Leaf Persistence 7 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
thermostat

Growing Parameters

thermostat
Temperature
41° – 95°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
40% – 90%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
3000 – 40000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
1000 – 2500
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
water
Soil Moisture
60% – 90%
% 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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