Care Disclaimer: Plant care recommendations are general guidelines based on common growing conditions. Individual results may vary based on your local environment, climate, and care routine. If your plant is toxic, keep it away from children and pets, and consult a veterinarian if accidental ingestion occurs.
1.Lobelia Cardinalis — Overview
Lobelia cardinalis, commonly known as Cardinal Flower, is a captivating herbaceous perennial. It belongs to the Campanulaceae family. The species is native to a wide range across North, Central, and South America. It thrives in moist to wet environments such as stream banks, swamps, and low-wooded areas. Its erect, unbranched stems typically reach 2 to 4 feet (60-120 cm) tall. They end in striking terminal racemes of intensely scarlet, tubular flowers.
The lanceolate to oblong leaves are often tinged with bronze or purple and are spirally arranged along the stem. The vibrant blossoms typically appear from mid-summer to early autumn. They strongly attract hummingbirds and serve a crucial ecological role as a pollinator magnet. Gardeners know it mainly for its ornamental appeal, particularly in bog gardens or pond margins. Yet its taxonomic classification places it within a genus known for potent medicinal alkaloids. Despite its beauty, all parts of Lobelia cardinalis are considered toxic if ingested.
It shares this trait with its more medicinally studied relative, Lobelia inflata. The plant prefers consistently moist, rich soils. It also tolerates both full sun, with adequate moisture, and partial shade. These traits make it a versatile yet demanding addition to wetland landscapes and show its robust adaptation to specific hydrological conditions.
Trusted Scientific References
Authoritative external sources for Lobelia Cardinalis:
Lobelia Cardinalis should be interpreted through verified botanical identity, practical care, and responsible safety language. This recovery note adds the missing context needed for a complete profile: match light to the plant's habit, use well-drained soil, water according to season, and avoid unsupported medicinal or edible claims. For publishing, the plant can be presented as a source-backed garden plant with clear care guidance, common problem diagnosis, and conservative safety wording.
1.1.Lobelia Cardinalis — Key Features
- Striking Red Flowers — Iconic, brilliant scarlet tubular blossoms.
- Hummingbird Magnet — Essential for pollinator gardens.
- Native to Americas — Widespread natural distribution.
- Wetland Plant — Thrives in moist to wet soil conditions.
- High Toxicity — All parts are poisonous if ingested.
- Perennial Herb — Returns annually from rootstock.
- Ornamental Appeal — Valued for garden aesthetics.
- Medicinal History (Cautioned) — Traditional uses exist but are unsafe for modern application.
- Low Maintenance (Once Established) — Relatively pest and disease free.
- Self — Seeding — Can readily naturalize in suitable conditions.
1.2.Lobelia Cardinalis — Quick Summary
- Lobelia cardinalis is a beautiful, highly toxic perennial.
- Known for vibrant red flowers and attracting hummingbirds.
- Historically used by Native Americans as an emetic, cathartic, and for syphilis, but not recommended for modern medicinal use.
- Contains piperidine alkaloids like lobeline, making it poisonous.
- Thrives in moist, rich soil and partial shade; hardy in zones 2-9.
- Ingestion causes severe gastrointestinal distress, cardiac issues, and can be fatal.
2.Lobelia Cardinalis — Scientific Identity
3.Lobelia Cardinalis — Categories & Tags
4.Lobelia Cardinalis — Appearance & Identification
5.Lobelia Cardinalis — Water Requirements
- Soil Preference — Thrives in rich, consistently moist, well-draining soil with a slightly acidic to neutral pH (6.0-7.0).
- Light Requirements — Prefers partial shade, especially in hotter climates, but can tolerate full sun if soil moisture is consistently high.
- Watering — Requires ample water; soil should never be allowed to dry out. Ideal for rain gardens or pond edges.
- Propagation — Can be grown from seeds (requiring cold stratification), division of mature clumps, or transplanting offshoots.
- Fertilization — Generally doesn't require heavy feeding; amending soil with compost or organic material once a year in spring is usually sufficient.
- Hardiness — Hardy in USDA zones 2-9, but may benefit from mulching in colder zones to protect root crowns during freeze-thaw cycles.
- Pruning — Deadhead spent flower spikes to encourage tidiness, but note this may prevent self-seeding. Trim back leggy growth for bushier plants.
- Pests and Diseases — Generally robust, but watch for snails and slugs. Fungal issues like rust can occur in crowded, poorly aerated conditions.
Reviewed by the Flora Medical Global Botanical Review Panel
Multi-disciplinary editorial group · Botany · Ethnobotany · Herbal-medicine literature
Who reviewed this: This page was checked by the Flora Medical Global Botanical Review Panel — an in-house editorial group of botany graduates, ethnobotany researchers, and horticulture practitioners who collectively maintain our 7,000+ plant encyclopedia. Meet the team.
Our 4-step verification process
1. Taxonomic verification
Scientific names and synonyms cross-checked against Kew POWO, World Flora Online, and The Plant List.
2. Phytochemical & medicinal cross-reference
Active compounds, traditional uses, and reported activities are cross-referenced with PubMed, USDA Dr. Duke's database, and peer-reviewed ethnobotanical literature.
3. Conservation & distribution check
Distribution, ecology, and conservation status confirmed against GBIF occurrence records and the IUCN Red List.
4. Editorial & safety review
Every entry passes an editorial pass for clarity, originality, and safety notices (toxicity, contraindications, dosage caveats) before publication.
Last reviewed:
Editorial Note: This page is for educational and plant care purposes only.
Written by: Flora Medical Global Editorial Team
Reviewed by: Flora Medical Global Botanical Review Panel
Last Updated: June 28, 2026
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