Silphium perfoliatum

Cup Plant

Unlike other silphiums, this plant is distinguished by its pairs of cup-forming leaves which clasp the square, central stem and hold water after a rain or heavy dew. Birds and insects are often seen sipping from the "cups." In summer, the plant blooms with soft yellow 3" flowers born atop stout stems.

Height 48-96 Inches

Spread 12-36 Inches

Bloom/Seasonal Color Soft Yellow

USDA Hardiness Zone 4-8

Characteristics & Attributes