Seed Pack - Cup Plant (Silphium perfoliatum)

This listing is for one packet of Cup Plant (Silphium perfoliatum) seeds. Each packet contains roughly 35 seeds. For best germination of native species, remember to scatter seeds October-January!

A.k.a. cup rosinweed. A taller plant with sunflower-like flowers. So called because the broad leaves hold water where they meet at the stem, where birds may stop to get a drink! Supports a wide variety of pollinators, and is favored by monarchs!
Does not shoot runners over distances, but rhizomes are robust and will form a dense, ever expanding clump. Easily propagated by rhizome. Best planted with other tall species that won’t be crowded out. Excellent for seasonally wet areas like ditches and floodplains.

Light: Full Sun, Part Sun/Shade

Soil Moisture: Wet Mesic, Mesic

Soil Type: Loam

Height: 5'-9'

Bloom Color: Yellow

Bloom Time: Jul-Sep

Root Type: Taproot

Notable Wildlife Interactions: Flowers attract bees, butterflies, skippers, wasps, and flies. Seed eating birds, particularly goldfinches, eat the seeds. Colonies provide shelter for birds, who will drink water from the ‘cups’. Commonly grazed by mammals.