University of Wisconsin-Madison | Botany Plant Growth Facilities

Botanical Garden

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Genus: Silphium Species: perfoliatum Common Name: Cup Plant Family: Asteraceae Order: Asterales Native: East-central North America Habit: Cormous Herbaceous Perennial Height: 4 to 8 feet Width: 2 to 4 feet Flowering Season: Summer Flower Color: Yellow Propagation: Seed and division Zone: 3-9 Note: Cup plant is suitable as a backdrop for other perennials or in open woodlands near ponds and streams. The opposite leaves on the upper and middle parts of its squared stem do not have petioles, and are united at the base which enclose the stem and form a cup. Flowers of this plant attract butterflies and birds. Prefers sunny, moist, ordinary garden soil.