
Plant Library

Cup Plant perfoliatum
Common Name: Cup Plant
Botanical Name: Silphium
Variety: perfoliatum
Blossom Color: Yellow
Bloom Time: Jul-Sep
Zone: 4 to 8
Exposure: Sun to Part Shade
Mature Height: 6'
Mature Width: 2-4'
Notes: This tall plant with pale yellow blossoms provides beauty for us as well as nectar for butterflies and seeds for the birds. Does well in average garden soil or in heavier wetter soils. Can be aggressive toward smaller plants so situate with care. Beneficial for pollinators and birds. Deer resistant.