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1.Silphium Laciniatum — Overview
Silphium laciniatum, commonly known as the Compass Plant, is a magnificent perennial wildflower native to the prairies and open woodlands of North America. Its most striking feature, and the source of its common name, is its remarkable heliotropism. The large, deeply lobed basal leaves, often reaching up to two feet in length, orient themselves in a north-south direction, with their edges pointing towards the equator. This unique adaptation is believed to help the plant conserve moisture in the harsh prairie environment by minimizing direct sun exposure during the hottest parts of the day.
As the plant matures, it sends up tall, erect stalks that can reach heights of 6 to 10 feet, crowned with large, daisy-like flower heads. These blossoms are a vibrant yellow, resembling sunflowers, and typically appear from midsummer to early autumn. The flowers attract a wide array of pollinators, including bees, butterflies, and various other beneficial insects, contributing significantly to the prairie ecosystem. The stems are rough and hairy, and when broken, they exude a sticky, bitter latex, which is thought to deter herbivores.
The root system is extensive and deep, allowing the plant to withstand drought and fire, both common occurrences on the prairie. The seed heads are also attractive, persisting well into winter and providing food and shelter for wildlife. Silphium laciniatum is a resilient and long-lived plant, often surviving for decades, making it a valuable addition to native plant gardens, meadows, and ecological restoration projects where its ecological contributions and striking visual appeal are highly appreciated. Its grandeur and ecological importance make it a true icon of the North American prairie.
Trusted Scientific References
Authoritative external sources for Silphium Laciniatum:
Silphium Laciniatum 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.Silphium Laciniatum — Key Features
- ["Distinctive north — south leaf orientation (heliotropism)", "Tall, erect flower stalks reaching 6-10 feet", "Large, sunflower-like yellow flower heads", "Deeply lobed basal leaves up to 2 feet long", "Rough, hairy stems with bitter latex", "Extensive and deep root system", "Drought and fire tolerant", "Attracts pollinators and beneficial insects"]
- Identified profile — Uses the accepted plant name and practical context for Silphium Laciniatum.
- Growth habit — Describes the plant through its visible form and seasonal behavior.
- Care fit — Connects light, water, and soil needs to cultivation.
- Garden value — Explains foliage, flowers, structure, or texture.
- Safety note — Keeps edible, medicinal, and toxicity language cautious.
- Propagation context — Mentions realistic propagation routes.
- Problem diagnosis — Links symptoms to water, light, drainage, pests, or season.
- Source ready — Keeps the profile suitable for later botanical review.
1.2.Silphium Laciniatum — Quick Summary
- Silphium laciniatum, or Compass Plant, is a tall, striking prairie wildflower with unique north-south orienting leaves.
- It features large yellow daisy-like flowers and a deep root system, making it drought-tolerant.
- Historically used for medicinal purposes, it's now valued for its ecological contributions and ornamental appeal in native gardens.
2.Silphium Laciniatum — Scientific Identity
3.Silphium Laciniatum — Categories & Tags
4.Silphium Laciniatum — Appearance & Identification
5.Silphium Laciniatum — Water Requirements
- Site Selection — Choose a location with full sun exposure (at least 6-8 hours daily) and ample vertical space, as *Silphium laciniatum* can grow very tall and wide.
- Soil Requirements — Thrives in deep, well-drained, loamy soils, tolerating a range from slightly acidic to slightly alkaline (pH 6.0-7.5); amend heavy clay soils with organic matter to improve drainage.
- Planting — Sow seeds in late autumn for natural cold stratification or cold stratify seeds for 2-3 months before spring planting; plant bare-root divisions in spring or fall.
- Watering — Water regularly during the first growing season to establish a deep root system; mature plants are highly drought-tolerant but benefit from supplemental watering during extended dry periods.
- Fertilization — Generally not necessary in fertile soils; if soil is poor, a balanced, slow-release organic fertilizer can be applied sparingly in early spring, but avoid excessive nitrogen.
- Pruning — Deadhead spent flower stalks to prevent prolific self-seeding and maintain a tidy appearance; cut back all foliage to the ground in late autumn or early spring for renewed growth.
- Pest and Disease Management — *Silphium laciniatum* is notably resistant to most common pests and diseases; ensure good air circulation to prevent potential fungal issues in overly humid conditions.
- Propagation — Primarily propagated by seed, which requires cold stratification for successful germination; established clumps can also be divided in early spring or fall.
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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