Lobelia siphilitica is a herbaceous perennial, growing between 2′ – 4′ feet tall on average and spreading up to 2′ feet across. It features an unbranched, sparsely hairy erect central stem bearing lively green foliage. The alternate leaves approximately measure 5″ inches long and are a maximum of 2″ inches wide.. Introduction. Lobelia siphilitica, commonly known as Great Blue Lobelia, is a herbaceous perennial plant native to the eastern and central regions of the United States. It is particularly prevalent in moist woodland areas and along stream banks. This plant is often valued for its striking blue flowers and its use in native plant gardens and naturalized areas.

Lobelia siphilitica (Great blue lobelia)

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Lobelia siphilitica (Great blue lobelia)

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Great Blue Lobelia ( Lobelia siphilitica) By David Taylor. Great blue lobelia, is a member of the Campanulaceae (Bellflower) family. The family includes around 2,400 mostly herbaceous species, most of which occur in North America, Europe and Asia. A number of species are from South Africa.. Blue Lobelia is a long-lived perennial flower native to Eastern North America. Scientifically known as Lobelia siphilitica, it will grow 2-4′ tall in full sun blooming up to two months beginning in late summer. Important to wildlife, Blue Lobelia will attract numerous species of bees, butterflies, and hummingbirds.