Lobelia cardinalis

Lobelia cardinalis (Cardinal Flower)

Overview

Uses: Ideal for rain gardens, naturalized areas, pollinator gardens, and water features. Stunning vertical accent for moist, partially shaded borders.

Benefits: Tall, vivid red flower spikes attract hummingbirds and butterflies! Thrives in wet soil where other plants struggle. Native perennial that adds bold, vertical drama to the garden.

USDA Hardiness Zones: 3 – 9

Sun: Full sun to partial shade

Life Cycle: Herbaceous perennial

Mature Height: 2' – 4'

Mature Width: 1' – 2'

Bloom Season: Mid to late summer

Summary

Bring vivid beauty and hummingbird magnetism to even the soggiest corners of your garden.

Lobelia cardinalis, commonly called Cardinal Flower, is a native North American wildflower celebrated for its tall spikes of scarlet-red blooms that emerge in late summer. Few plants offer such a striking vertical accent, especially in damp or boggy spots where many others fail.

With its lush green leaves and glowing red flowers, Cardinal Flower shines in rain gardens, streambanks, pond edges, or any moist site where you want to draw in pollinators. Hummingbirds flock to its tubular blooms, and butterflies can't resist the nectar. While short-lived by nature, it reseeds gently to maintain a long-lasting presence in the garden.

Care

Cardinal Flower Care

Plant in full sun to partial shade. In warmer regions, some afternoon shade helps preserve bloom quality and prolong plant vigor.

Grow in consistently moist to wet soil, ideally rich in organic matter. This plant thrives in boggy conditions and does best in areas with regular access to water, such as rain gardens or alongside ponds and streams.

Water frequently during dry spells, especially during its first year or in drier planting sites. Avoid allowing the soil to dry out completely.

Fertilization is optional but may boost performance in lean soils. Use a balanced, slow-release fertilizer in spring if desired. Our slow release fertilizer is a great option.

Deadhead to extend the bloom period, or allow flowers to go to seed to encourage gentle reseeding.

Cut back spent flower stalks in fall or early spring. Mulch lightly in colder zones to protect the crown over winter.

Size

What Size is Cardinal Flower for Sale Online?

Our Lobelia cardinalis ships in a greenhouse-grade grow pot. Each plant is appropriately sized for its container. Please contact us with any specific questions.

How Large Does Cardinal Flower Grow?

Cardinal Flower typically reaches a mature height of 2 to 4 feet and spreads about 1 to 2 feet wide, forming tidy upright clumps.

Additional Information

Common Names of Lobelia cardinalis

• Cardinal Flower

• Red Lobelia

• Scarlet Lobelia

Toxicity and Risks of Cardinal Flower

While Cardinal Flower is not widely considered highly toxic, all parts of the plant contain alkaloids and should not be ingested. Use caution around pets or children, particularly if they are prone to chewing on plants.