Cardinal Flower
Lobelia cardinalis
Cardinal flower is one of the only native plants in North America with bright pure red color — and it's pollinated almost exclusively by ruby-throated hummingbirds, whose long bills can reach the deep nectar tube that bees cannot.
How to care for cardinal flower
Loves wet feet — perfect for boggy spots, pond edges, or low-lying garden corners that other plants dislike. Short-lived (3-4 years) but self-seeds reliably. Mulch lightly in fall but DON'T pile mulch on the basal rosette.
Garden uses & design ideas
Best garden use
Place it in repeatable drifts through borders so the color and texture carry the eye instead of appearing as a one-off plant.
Pair it with
Joe Pye weed, Iris (water-loving), Astilbe make easy companion choices because they share similar light, water, or visual texture needs.
Layout tip
Match it with part sun exposure, keep it in the same moist-bed zone as other thirsty plants, and check USDA zones 3-9 before planting. Use the garden planner to test spacing around its mature size: 2-4 ft tall, 12-18 in wide.
Gardener note — Double-check local invasive, edible, and toxicity guidance with your county extension office before planting around pets, children, or natural areas.
Companion plants
Cardinal Flower grows well alongside these — similar light, water, and texture needs.
Common pests & problems
Where it grows best
Native to Eastern and Central North America; thrives in USDA hardiness zones 3-9.
Frequently asked about cardinal flower
What USDA zones does Cardinal Flower grow in?+
Cardinal Flower is hardy in USDA zones 3-9. Outside these zones, it can usually be grown indoors or as a seasonal annual.
How much sun does Cardinal Flower need?+
Cardinal Flower prefers part sun. Place it where it gets that light most of the day for best growth and flowering.
How often should I water Cardinal Flower?+
Cardinal Flower has high water needs. Water frequently — this plant prefers reliably moist soil. Loves wet feet — perfect for boggy spots, pond edges, or low-lying garden corners that other plants dislike. Short-lived (3-4 years) but self-seeds reliably. Mulch lightly in fall but DON'T pile mulch on the basal rosette.
How big does Cardinal Flower get?+
Cardinal Flower reaches a mature size of 2-4 ft tall, 12-18 in wide. Growth rate is moderate, so plan spacing accordingly when planting.
What plants grow well with Cardinal Flower?+
Cardinal Flower pairs well with Joe Pye weed, Iris (water-loving), Astilbe. These companions share similar care requirements and don't compete aggressively for resources.
What pests affect Cardinal Flower?+
Common Cardinal Flower problems include essentially pest-free; deer-resistant. Catching early signs in routine inspection prevents most damage.
When does Cardinal Flower bloom?+
Cardinal Flower blooms in mid to late summer in intense scarlet red. Deadheading spent flowers (where applicable) often encourages a longer bloom window.
More plants to design with
Pair well with cardinal flower or suit the same spot.
Perennial
Perennial
Perennial
Perennial
Annual
Perennial