Silphium perfoliatum


Common Name: cup plant
Plant Type:Herbaceous
Light (original): sun, part sun
Light Requirements: Sun, Part Sun
Height:3 to 8 feet
Width:4 to 5 feet
Duration:Perennial
Habitat:Wetland
Soil Type:moist to dry
Soil Moisture:Dry, Mesic
Seed Ripens:
USDA Zones:3 to 9
Flower Colour:yellow
Bloom Time:summer
Comments:SW Ontario and Toronto. Good nectar plant. Birds enjoy seeds.
Germination:Seed will germinate upon being shifted to 70°F after 90-140 days of moist, cold stratification at 40°F.
Germination Notes:
Grow Notes:
Picture Copyright: John Oyston