Lobelia siphilitica 'Great Blue Lobelia'

Lobelia siphilitica, also known as great blue lobelia or blue lobelia, is a perennial herbaceous plant that is native to North America. It typically grows to a height of 2-4 feet, and has spikes of showy, blue, or purple flowers that bloom in late summer to fall. The leaves are lance-shaped and are arranged alternately on the stem. They are typically 2-6 inches long and 1-2 inches wide, with a smooth or slightly hairy surface. 

The flowers of Lobelia siphilitica are arranged in spikes, typically measuring 2-4 inches long. They are tubular in shape, and typically blue or purple in color, with a slightly curved shape. Each flower has five petals and the flowers are arranged in a spiral pattern on the stem. They are very attractive to hummingbirds, butterflies, and other pollinators. The flowers bloom in late summer to fall and they last for a short period of time, but the plant produces a large number of flowers, which bloom in succession, making the plant look in bloom for a long time.

Blue lobelia is a moisture-loving plant, it prefers moist soils and it can be grown in wetlands or near water. It is hardy and it can tolerate a wide range of soil types. It can also be grown in full sun or partial shade. It is a great option for gardens, wildflower meadows or as a marginal aquatic plant. It is also a great option for rain gardens or other low-lying areas that are prone to flooding.