February 4, 2023
Lobelia siphilitica © onlineflowergarden.com

Lobelia siphilitica is part of the Campanulaceae family of plants. It is also known as the Great Blue Lobelia, Great Lobelia, Big Blue Lobelia, Virginia Bellflower, Vomit Root, Tall Blue Lobelia, or Blue Cardinal Flower. It is native to North America, eastern and central Canada, and the United States.

Lobelia siphilitica is an unbranched perennial. It grows to about 3ft or 90cm. It is a short-lived perennial but it will live for a few years.

Lobelia siphilitica
Lobelia siphilitica

Lobelia siphilitica produces zygomorphic, violet-colored flowers. It flowers on the axils of leafy bracts. It flowers in late summer or August to October. The flowers have a two-split upper lip and a three-split lower lip. Lobelia siphilitica requires the help of pollinators to reproduce.

Grow Lobelia siphilitica in sun, partial or full shade. Plant it in moist soil that is well-drained. It can survive in most types of soil but it loves moisture. It attracts bees, birds, and butterflies.

It could be toxic if consumed in large quantities. Propagate Lobelia siphilitica by division in spring or by seed which would require stratification for about 8 weeks. Lobelia siphilitica is deer-resistant and rabbit-resistant. Deadhead for more blooms or to prevent self-seeding.

Lobelia siphilitica
Lobelia siphilitica at Flower Walk in Hyde Park, London

Also read about Lobelia cardinalis

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