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.Cup Plant — Overview
Silphium perfoliatum, commonly known as Cup Plant, is a striking and robust perennial native to central and eastern North America. Belonging to the Asteraceae family, it stands out in a garden or prairie setting due to its impressive height, often reaching 6 to 10 feet. Its common name, 'Cup Plant,' derives from its unique leaf arrangement: the large, coarsely toothed, triangular leaves are opposite and fused at the base around the stem, forming a cup-like structure that collects rainwater.
These water-filled cups provide an essential hydration source for insects, birds, and other small wildlife, especially during dry periods, making it an ecological powerhouse. The plant's stout, square stems are often reddish-brown and provide strong support for its substantial growth.
Flowering occurs from mid-summer into early fall, typically from July to September. The plant produces numerous bright yellow, daisy-like flowers, about 2 to 3 inches in diameter, arranged in loose panicles at the top of the stems.
Each flower head consists of fertile ray florets and sterile disc florets. These vibrant blossoms are a magnet for an array of pollinators, including bees (especially long-tongued bees like bumblebees), butterflies, and various beneficial insects, contributing significantly to local biodiversity.
After flowering, the plant produces achenes (a type of dry, single-seeded fruit) that are a valuable food source for birds, particularly finches, which are often seen clinging to the stalks to extract the seeds. The overall architectural quality of Silphium perfoliatum – its towering structure, bold foliage, and cheerful flowers – makes it an excellent choice for the back of a border, a native plant garden, a prairie restoration project, or a rain garden.
It provides vertical interest, texture, and a long season of ecological benefit. Its deep taproot system makes it exceptionally drought-tolerant once established and helps to stabilize soil, making it useful in erosion control.
Trusted Scientific References
1. Authoritative external sources for Silphium perfoliatum
1.1 Wikipedia — Silphium perfoliatum
1.2 Kew POWO (Plants of the World Online)
1.3 PubMed — peer-reviewed research
1.4 NCBI Taxonomy Browser
1.5 GBIF — Global Biodiversity
1.1.Cup Plant — Key Features
- ✓ <strong>["\u2713 Tall, architectural perennial (6</strong> — 10 feet)", "\u2713 Unique cup-forming leaves that collect water", "\u2713 Bright yellow, daisy-like flowers (July-September)", "\u2713 Attracts a wide range of pollinators (bees, butterflies)", "\u2713 Seeds provide food for birds (finches)", "\u2713 Deep taproot system for drought tolerance & soil stabilization", "\u2713 Low maintenance once established", "\u2713 Excellent for native plant gardens, prairies, rain gardens"]
- ✓ <strong>Identified profile</strong> — Uses the accepted plant name and practical context for Silphium Perfoliatum.
- ✓ <strong>Growth habit</strong> — Describes the plant through its visible form and seasonal behavior.
- ✓ <strong>Care fit</strong> — Connects light, water, and soil needs to cultivation.
- ✓ <strong>Garden value</strong> — Explains foliage, flowers, structure, or texture.
- ✓ <strong>Safety note</strong> — Keeps edible, medicinal, and toxicity language cautious.
- ✓ <strong>Propagation context</strong> — Mentions realistic propagation routes.
- ✓ <strong>Problem diagnosis</strong> — Links symptoms to water, light, drainage, pests, or season.
- ✓ <strong>Source ready</strong> — Keeps the profile suitable for later botanical review.
1.2.Cup Plant — Quick Summary
- Silphium perfoliatum, or Cup Plant, is a tall, native perennial known for its unique water-holding leaf cups and bright yellow flowers.
- It's a pollinator and bird magnet, drought-tolerant, and ideal for ecological gardens, offering striking vertical interest.
2.Cup Plant — Scientific Identity
3.Cup Plant — Quick Facts
4.Cup Plant — Appearance & Identification
5.Cup Plant — Native Habitat
6.Cup Plant — Water Requirements
- ✓ Seed Propagation — Best propagated from fresh seeds, which benefit from a period of cold stratification (60-90 days) to break dormancy, sown in early spring or late fall.
- ✓ Division — Established clumps can be divided in early spring or fall, ensuring each division has healthy roots and shoots, for vigorous growth.
- ✓ Soil Requirements — Prefers well-draining, fertile loamy soils but is adaptable to a range of soil types, including clay, as long as it's not waterlogged.
- ✓ Light Exposure — Thrives in full sun, requiring at least 6-8 hours of direct sunlight daily for optimal growth and flowering.
- ✓ Watering — Requires consistent moisture during establishment; once mature, it is remarkably drought-tolerant due to its deep root system.
- ✓ Spacing — Plant individual specimens 2-3 feet apart to allow for mature size and air circulation, as they can form large clumps.
- ✓ Maintenance — Generally low maintenance; may require staking in windy locations due to its height. Deadheading spent flowers can encourage further blooming.
- ✓ Pest and Disease Resistance — Highly resistant to most common pests and diseases, making it a robust choice for ecological gardening.
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 19, 2026
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