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Silphium perfoliatum - Cup Plant

* Unavailable for 2024

Sun Exposure: Sun, Part Sun

Soil Moisture: Medium-Wet, Medium

Soil Type: Sand-Loam, Loam, Loam-Clay

Height: 6 feet feet

Spread: 2 - 4 feet

Blooms: July, August, September

Root: Fibrous

Habitat: Moist Prairies and Meadows, Low-lying woodland edges and thickets, Lake borders, Fence rows

Landscape uses: Pollinator garden, Rain garden, Meadow planting, Naturalization 

Complimentary Plants: Spotted Joe Pye Weed, Swamp Milkweed

Wildlife Value: Bees, flies and butterflies visit the flowers for pollen and nectar, Leaves surround stem and provide resevoir that collects rain water which pollinators and birds can drink from 

Seed Origin: Coldwater, ON (Wildflower Farm seed supplier)

Germination Code: C(60)

Silphium perfoliatum - Cup Plant

Comming Soon
  • Cup plant stands tall at six feet - higher in wetter soils, smaller in drier soils. The flowers are valuable to pollinators and seeds for birds and small mammals. The "perfoliatum" leaves clasp the stem and create a small basin that collects rain water - hence the name "Cup" plant. As this is a tall plant that spreads out easily, it is not recommended for a small garden planting, as it may outcompete smaller plant species. 

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