Blue Cardinal Flower Lobelia Siphilitica. 12 - 18 inches wide. Native clump forming perennial that features light to dark blue tubular flowers.
The plant can grow to be between 1 to 6 feet tall and has 8-inch long red or blue tubular flowers that bloom from May to October Wildflower Database. Blue flowers first mature in mid-summer and continue into early fall. Great Blue Lobeliais a native erect perennial growing from 1 to 4 feet high on stems that seldom branch below the inflorescence.
Lobelia siphilitica Great Blue Lobelia A North American native that is perfect for the late summer garden Lobelia siphilitica Great Blue Lobelia is a popular upright perennial which produces long-lasting spikes of bright blue flowers atop a finely-toothed lance-shaped foliage from late summer to mid fall.
Native clump forming perennial that features light to dark blue tubular flowers. The species epithet is because at one time it was believed the plant was used by native Americans to treat syphilis. Color ranges from light blue to bright blue-violet. Lobelia siphilitica commonly called great lobelia or blue cardinal flower is a Missouri native perennial which typically grows in moist to wet locations along streams sloughs springs swamps meadows and in low wooded areas.