Botanical Name: Silphium perfoliatum
En Français: Silphie perfoliée
Cup plant, Silphium perfoliatum, is a beautiful native Ontario plant. Its large stature, (6 to 9 feet tall), and wide, tapered leaves are further complemented by an abundance of open yellow flowers. The flowers will re-bloom well into the autumn.
A large plant that needs lots of space. Some gardeners find it to be an effective backdrop for other perennials. Adapts well to prairies, wildflower/native plant gardens, naturalized areas or moist, open woodland areas including stream/pond edges.
Planting and Care Considerations
Easily grown in average, medium to wet soils in full sun; tolerates some drought once established. Somewhat slow to establish when grown from seed. Self-seeds in optimum growing conditions.
Spread: Up to 90 cm
Water: Dry to Moist
Best Soil: Loam