Cardinal Flower

Lobelia cardinalis
Cardinal flower (lobelia cardinalis)
Cardinal flower (lobelia cardinalis)
Plant TypeFlowering Perennials
Sun ExposureFull Sun (6+ Hrs), Part Sun / Shade (3-6 Hrs)
HeightShort (1-3')
MoistureMedium, Wet
Bloom MonthsJuly, August, September
Moisture NeedsFlood Tolerant
Season of InterestSummer (Jun-Aug), Fall (Sep-Nov)
Ecological SignificanceNative Bee Friendly, Butterfly Friendly, Hummingbird Friendly

Description

Cardinal Flower is a stunning native perennial known for its tall spikes of brilliant scarlet-red flowers that bring a dramatic burst of color to wetlands, rain gardens, and shaded borders. Blooming from mid to late summer, it creates a striking vertical accent and provides a vital source of nectar when few other red flowers are in bloom. The flowers are tubular and perfectly adapted for hummingbirds, which are its primary pollinators. With its deep green foliage and bold, upright habit, Cardinal Flower adds elegance and intensity to any moist garden space.

Ecological Value

Lobelia cardinalis is a favorite of Ruby-throated Hummingbirds, which rely on its tubular blossoms for high-energy nectar. It also attracts native bees and swallowtail butterflies, making it a valuable late-season pollinator plant. Though not a larval host plant, its reliable nectar production and bloom timing help sustain pollinators through the summer months when other sources may be limited.

Ideal Growing Conditions

Cardinal Flower grows best in full sun to partial shade and prefers moist to wet soils rich in organic matter. It naturally occurs along stream banks, pond edges, and low meadows, where the soil stays consistently damp. While it can tolerate some seasonal drying, it will not thrive in areas that remain dry for extended periods. Plants may short-live in dry sites, but they readily reseed in suitable conditions, forming natural colonies over time. Mulching and consistent moisture help ensure vigorous growth and strong flowering each year.

Landscape Uses

Ideal for rain gardens, pond edges, and shaded borders, Cardinal Flower brings vivid color and graceful structure to damp garden settings. It combines beautifully with Great Blue Lobelia, Blue Flag Iris, and native sedges for a layered, natural look. Because it attracts hummingbirds so reliably, it’s an excellent choice near patios or windows where you can enjoy their visits. With the right moisture and a bit of afternoon shade, Cardinal Flower will return year after year, offering one of the most brilliant red displays in the native plant garden.”

Cardinal Flower Native Range

Map Color Key

Species present in state and nativeSpecies present and not rare
Species not present in stateSpecies present and rare

Kartesz, J.T., The Biota of North America Program (BONAP). 2015. North American Plant Atlas. (http://bonap.net/napa). Chapel Hill, N.C. [maps generated from Kartesz, J.T. 2015. Floristic Synthesis of North America, Version 1.0. Biota of North America Program (BONAP). (in press)].

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