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…
Its natural habitat is, Prairies and meadows.
Companion plant suggestions include Try it with Aster, Hibiscus, Monarda fistulosa or Panicum virgatum
Caring for Cup Plant
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.
It is happiest in Loam
In terms of water, Cup Plant needs Dry to Moist