Silphium perfoliatum
Cup Plant (Silphium perfoliatum) is a tall, perennial native wildflower known for its square stems and large, opposite leaves that form a cup around the stem, often holding rainwater. It typically grows 6-8 feet tall and has a mounded, robust growth habit, making it a striking addition to gardens and naturalized areas. Cup Plant thrives in full sun but can tolerate partial shade, and it prefers medium to wet soils, though it is adaptable to a range of moisture conditions, including clay and mesic soils. Once established, it is drought-tolerant but grows best with consistent moisture. This species is valued for its ability to support pollinators and wildlife, providing both nectar and water. Its bold presence and ecological benefits make it a favorite for prairie restorations and pollinator gardens.
- Native range
- Central and Eastern United StatesNative here
- Bloom time
- July – September
- Garden location
- Southwest Sidewalk Bed