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For successful seedlings,
see the growing notes at the bottom of the page!
Great blue lobelia (Lobelia siphilitica), also know as blue cardinal flower, is a native perennial plant found in wetland environments, growing up to 1 meter in height. It produces bright blue, trumpet-shaped flowers arranged along upright stems, blooming in July and August. Its leaves are serrated, dark green, and slightly hairy. Adapted to moist soils, great blue lobelia thrives along streams, in marshes, and wet meadows, attracting a variety of pollinators, including bees and hummingbirds.
Ecological Roles
Great blue lobelia is valuable to wetland ecosystems, where it attracts a wide range of pollinators, including bees, butterflies, and hummingbirds. Its trumpet-shaped flowers provide an important nectar source late in the season. It also contributes to the stability of wet soils, helping to prevent erosion along streambanks and waterways.
Great blue lobelia seeds require cold stratification to ensure germination. See the cultivation notes below for more details.
Akène cannot assume any responsibility for the use of plants for therapeutic purposes. Always seek advice from a professional before using a medicinal or edible plant.
Sowing and Growing
Technical Details
Seeds per packet: 200
Family: Campanulaceae
Scientific name: Lobelia siphilitica
Life cycle: Perennial
Hardiness zone: 4
Soil type: Sandy to loamy
Soil moisture level: Medium to wet
Soil - additional attributes:
Light: Sun, part shade
Blooming: July to August
Spacing: 30 to 45 cm
Height: 90 cm
Deer resistance: High
Stratification: 60 days
Scarification: No
Germination time: 1 to 10 weeks (irregular)
Sowing depth: Surface