Lobelia siphilitica aka Great Blue Lobelia

Taxonomy

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.

Common names

Great Blue Lobelia, Blue Lobelia, Great Lobelia

How to care for Great Blue Lobelia

Difficulty

Great Blue Lobelia presents a moderate level of care, which allows plant enthusiasts with some experience to expand their skills and knowledge.

Water

Great Blue Lobelia should be watered regularly, allowing the soil to dry out between waterings.

Soil

Great Blue Lobelia loves a well-draining soil. Perlite and vermiculite help with drainage, while coco coir adds organic matter, so a good potting soil mix will have all three. You can improve store-bought soil by adding some perlite to it.

Lighting

To ensure optimal growth, the Great Blue Lobelia prefers bright diffused light for 6-8 hours each day. Insufficient light can result in slow growth and leaf drop, so it's important to find a well-lit location for this plant. Place it near a window, within a distance of 1 meter (3 feet), to enhance its potential for thriving.

Dormancy

During the wintertime, it's common for Great Blue Lobelia to go dormant and their growth may slow down, so waterings should be spaced out more.

Toxicity

Great Blue Lobelia is poisonous if ingested. We suggest keeping this plant out of reach if you have children, cats, or dogs in the home.

Growth-pattern

Great Blue Lobelia grows vertically and new growth emerges from the top of the plant.

Region of origin

Great Blue Lobelia’s native range is Eastern N. America - Maine to S. Dakota, south to Texas and Missouri.


More info:
Wikipedia