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Great Blue Lobelia
Scientific Name: Lobelia siphilitica L.
Synonym: Lobelia syphilitica
Family: Campanulaceae
Great Blue Lobelia (Lobelia  siphilitica)
Robert H. Mohlenbrock. USDA SCS. 1989. Midwest wetland flora: Field office illustrated guide to plant species.
Recommended Temperature Zone:
sunset: 2-9,14-17
USDA: 5-10

Heat Tolerance: Afternoon shade in hot areas

Sun Exposure: Part shade

Origin: Eastern USA, along streams and in swampy areas

Growth Habits: Herbaceous perennial, 2 to 3 feet tall (60-90 cm), 1 to 1.5 feet spread (30-45 cm); leaves 0.8 to 2.4 inches wide (2-6 cm), 3.2 to 6 inches long (8-15 cm)

Watering Needs: Bog plant, needs continuous moisture

Propagation: Clump division in spring, seeds, may self-seed

The name 'siphilitica' comes the a medicinal usage of the plant to treat venereal diseases.

Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 300.

Blooming Habits:
Blue (white to purple) flowers, 0.8 to 1.2 inches long (2-3 cm) in a terminal raceme, up to 2 feet long (60 cm) or more, in August to October.

Fruiting Habits:

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Desert-Tropicals is dedicated to provide gardening advice, gardening ideas, and information about flower of all kind for landscape and collections. We try to check carefully the identification of the plants on the illustrations as well as the other information from the page, but occasionally errors do occur. if you notice anything that needs to be changed please contact us. Thanks.

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