Kenny's Perennials - Best Perennials in WNC - serving Western North Carolina since 2008.

Cup Plant

Added on by solomon house.

Cup Plant

Silphium perfoliatum

Easily grown in average, medium to wet soils in full sun. Prefers moist, rich soils, but tolerates some drought once established. Somewhat slow to establish when grown from seed.  

Growing Conditions

Height 4.00 to 8.00 feet
Light Requirements Full sun
Bloom time July to September
Zone 3 to 9

Additional Info

Self-seeds in optimum growing conditions


All info from Missouri Botanical Garden