Lobelia siphilitica/Great Blue Lobelia, Blue Cardinal flower

Lobelia siphilitica / Lobelia siphilitica
A colony of Lobelia in full bloom
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A colony of Lobelia in full bloom

A close-up image of the bright blue flowers

Flowers in late summer

A mature clump of the Lobelia

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Scientific Name: Lobelia siphilitica
Common Name: Great Blue Lobelia, Blue Cardinal flower
Hardiness Zone: 4, 5, 6, 7, 8 Determine Your Zone
Height: 2- 5 feet
Spread: 1-2 feet
Bloom time: Summer, Fall
Flower color: Blue
Light Exposure: Sun, Morning sun
Drainage: Well drained, Moist
Rate of Growth: Moderate
Water Requirement: High
Maintenance Level: Low
Susceptible to insects
and diseases:
Comments: This is a great clump-forming perennialfor the cooler parts of the country. Otherwise might need more shade in warmer regions of the country. Tolerates a wide range of moist soil conditions. Bright blue flowers are borne on unbranched, leafy stalks. Used as a medicinal plant in early times. Excellent perennial for native plant garden, woodland garden and effective near ponds and streams. Self-seeding is common where growing conditions are favorable.