Lobelia cardinalis
Overview
Uses: Rain gardens, pond edges, streambanks, naturalized plantings, and moist borders.
Benefits: Brilliant red flower spikes; thrives in consistently moist to wet soils; supports hummingbirds and pollinators.
USDA Hardiness Zones: 3–9
Sun: Full Sun to Partial Sun/Shade
Life Cycle: Hardy Perennial
Growth Habit: Upright, Clumping — vertical flowering spikes rising above basal foliage.
Bloom Color: Scarlet Red
Mature Height: 2–4 feet
Mature Width: 1–2 feet
Bloom Season: Mid to Late Summer
Growth Rate: Moderate
Summary
Cardinal Flower is a native perennial known for its striking red blooms and adaptability to moist garden conditions.
Lobelia cardinalis produces tall spikes of vivid scarlet flowers in mid to late summer, providing vertical structure and seasonal color. Its upright form makes it especially effective in rain gardens, near water features, or in consistently moist borders.
Native to North America, it supports hummingbirds and other pollinators while performing reliably in soils that remain damp throughout the growing season.
Care
Cardinal Flower Care
Plant in consistently moist to wet soil enriched with organic matter. It performs best in locations that do not dry out.
Full sun to partial shade is ideal. In warmer climates, light afternoon shade may help preserve plant vigor.
Water regularly during establishment and avoid allowing soil to dry completely.
If soil fertility is low, apply a slow release fertilizer in early spring.
Allow flowers to set seed for natural reseeding, or deadhead to limit spread.
Size
What Size is Lobelia cardinalis for Sale Online?
Plants ship in greenhouse-grade grow pots and are appropriately sized for their containers. Please contact us with specific size questions.
How Large Does Lobelia cardinalis Grow?
Expect mature plants to reach 2–4 feet tall and 1–2 feet wide under average garden conditions.
Additional Information
What are some common names for this plant?
It is commonly known as Cardinal Flower, Red Lobelia, or Scarlet Lobelia.
Is Lobelia cardinalis native to the United States?
Yes. It is native to much of eastern and central North America. Browse additional regional selections in our Native Plants collection.
Does Cardinal Flower attract hummingbirds?
Yes. The tubular red flowers are highly attractive to hummingbirds during bloom season.
Can Cardinal Flower grow in wet soil?
Yes. It performs best in consistently moist or even wet soils and is well-suited for rain gardens.
Where can I find more moisture-loving perennials?
Explore our full selection of Perennials for additional options suited to damp garden sites.
