Lobelia siphilitica - Great Lobelia
Lobelia siphilitica, commonly called great lobelia or blue cardinal flower, is a clump-forming perennial which features light to dark blue, tubular flowers typically rising 2-3' tall and lance-shaped, light green leaves. Lobelia siphilitica provides late summer bloom to the perennial border, wild garden, native plant garden, woodland garden or naturalized planting. Also effective near ponds or streams. Excellent addition to the hummingbird garden.