Description: Spikes of blue flowers that bloom in late summer.
Growth Habit: Upright, clump-forming perennial. 3ft height
Sun/Shade: Full sun to partial shade.
Water Needs: High; prefers moist to wet soil.
Soil Preferences: Rich, moist soil.
Benefits: Attracts pollinators and thrives in wet areas. Great for rain gardens and pond edges.
 
From Prairie Moon Nursery:
Lobelia siphilitica offers a deep-hued counterpoint to the yellows of late summer. This colony-forming, short-lived perennial grows well in medium to wet soils, especially with a little shade. In its native range, Great Blue Lobelia can be found in wet prairies, soggy meadows, pond and creek edges, marshland borders, and other moist areas. 
 
Great Blue Lobelia grows large, richly-flowered spikes. The deep blue-violet flowers on these spikes attract many bees, butterflies, and hummingbirds. Lobelias produce a secondary compound known as "lobeline," which deters herbivores.