Silphium perfoliatum (Cup Plant) with yellow flowers in quart size pots.
Close-up of Silphium perfoliatum (Cup Plant) yellow flower and namesake 'cup' filled with water.

Silphium perfoliatum (Cup Plant) Unity Grown

Regular price$2.95
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Silphium perfoliatum, commonly called cup plant, is a large, upright perennial wildflower that grows to towering heights of up to eight feet tall. Commonly found in low woodlands, wet meadows, and other moist, disturbed areas, Silphium perfoliatum produces profuse bright-yellow, sunflower-like flowers through the summer, up to 3" in diameter; these yellow blooms are attractive to hummingbirds, as well as a number of butterflies and other pollinators, and flowers turn to persistent seedheads in the fall which attract birds.

Silphium perfoliatum's common name, cup plant, comes from the cup-like formation of leaves around the center stalk, which collect rainwater through the growing season, occasionally catching bugs, but more commonly serving as a safe water source away from the ground for birds. Cup plant is tolerant of heavy, wet soils, including clay, and dense, fibrous roots make it well suited for erosion control and use in rain gardens, but is versatile enough to be planted anywhere there's room for its tall stems.
Native to Maryland, Native to U.S., and Straight Species
Mature Plant Height: Very Tall: 73" and up
Deciduous
Sun (6+ hours) and Part Shade/Sun (4-6 hours of sun)
Soil Moisture: Medium to Wet
Soil Type: Wide Tolerance
Bloom Time: Summer
Flower Color: Yellow
Foliage color: Green
Features: Attracts Hummingbirds, Attracts Butterflies, Attracts Pollinators, Attracts Birds, and Erosion Control
Tolerances: Clay Soil Tolerant, Deer Tolerant, and Wet Soil Tolerant
Garden Type: Meadow, Pollinator Garden, Rain Garden, and Woodland Garden

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