Lobelia siphilitica aka Great Blue Lobelia

Lobelia siphilitica, also known as great blue lobelia, blue cardinal flower, or great lobelia, is a stunning herbaceous perennial dicot that is native to central and eastern Canada and the United States. This plant belongs to the Campanulaceae family and is characterized by its distinctive, bright blue blooms that appear from August to October. It grows upright, reaching an average height of 2 to 4 feet and spreading up to 2 feet across. The central stem of Lobelia siphilitica is unbranched and sparsely hairy, with lively green foliage. Bees are the primary pollinators of this self-compatible plant, using the lower three fused petals as a landing pad on their way to the nectar. A correct weight bee will depress the petals, lowering the stigma and wiping it against its back. Lobelia siphilitica is a short-lived plant, lasting only a few years. There are two recognized varieties of this plant, Var. siphilitica and Var. ludoviciana. In 1993, it was selected as the NC Wildflower of the Year. With a medium flammability rating, this plant is perfect for adding vertical interest to any landscape in a graceful manner.