Cup Plant

Cup Plant

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.

Other Characteristics

Pollinators: Birds, Butterflies, Hummingbird

Sun/Shade: Full Sun

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.

Try it with Aster, Hibiscus, Monarda fistulosa or Panicum virgatum

Spread: Up to 90 cm

Water: Dry to Moist

Best Soil: Loam

Growth Habit: