Plant types and subtypes: Perennials
Light Requirements: sun, part-sun
Water Use: medium
Soil Moisture: moist
Soil Description: rich, loam, clay
Bloom Time: June, July, August
Bloom Color: yellow
Leaf Color: green
Hardiness Zone: 6, 7
Additional Tags: attracts birds, attracts butterflies, attracts hummingbirds, clumping, colonizing, cottage garden plant, naturalizing
Pricing & Availability
Silphium perfoliatum var. connatumAlso known as:
New River cup plant
Silphium connatum, Silphium scabrum
The cup plant is an awe-inspiring, majestic plant. Reaching heights of up to 10 feet, it will form clumps up to 6 feet wide, topped with large 2" to 4" yellow flowers resembling sunflowers . Large triangular, downy leaves join at their bases to form water-holding cups around the stout, square, purplish, hairy stems. Birds will actually bathe in the cups after a rain. A beautiful specimen!
Enjoying full sun to light shade, Silphium perfoliatum var. connatum does best in rich, moist, loamy soil. It is very easy to grow and requires very little care. Due to its sheer size, it will create a visual focal point wherever it is placed. Its ability to self seed can make it somewhat invasive. It blooms from June through August. Zones 6-7
Plants self propagates readily by seed. Mature clumps are deep rooted and may be difficult to divide, however, young offshoots can be removed and transplanted.
Although Silphium perfolatum has an extensive native range from the Midwest to the entire East-coast, its variety connatum is native only to VA, WV, MD, NC and can be identified by its hairy stems and sessile leaves. The genus got its common name rosinweed, because of the large amounts of resin exuded from injured parts of the plant.
Native Range & Classification
Recorded County Distribution: USDA data
AL, AR, CT, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, NC, ND, NE, NJ, NY, OH, OK, PA, SD, TN, VA, VT, WI, WV
USDA Endangered Status:
- Threatened: MI
|Species||Silphium perfoliatum var. connatum||cup plant|