Silphium perfoliatum - Cup Plant
Cup Plant (Silphium perfoliatum) is a tall, highly aggressive, clump-forming perennial. It is distinguishable by its stout, hairless square stem and pairs of clasping leaves. It produces a panicle of numerous yellow composite flowers with darker yellow center disks near its apex. The common name comes from the clasping leaves forming a "cup" around its central stem that catches rainwater, which provides great food, water, and cover for birds.
Soil Moisture: Dry, Moderate, Wet
Sun Exposure: Full Sun, Partial Shade
Height: 5' - 10'
Spread: 3' - 5'
Hardiness Zone: 3 - 8
Bloom Color: Yellow
Bloom Time: July, August, September
Attracts: Birds, Butterflies, Hummingbirds, Pollinators
SILPHIUM (rOSINWEED):
Silphium is a genus of flowering plants that are native to North America, and is commonly referred to as rosinweeds. They are very tall perennials that can grow taller than 8 feet, and have yellow flowers that can resemble sunflowers. With rosinweeds, the flower's outer florets are fertile and the inner florets are sterile, but in sunflowers it is the opposite. Silphium is an ancient Greek word for a North African plant whose identity has been lost and was claimed to be extinct in Roman times, but its gum or juice was prized as a medicine and condiment.
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