Cup Plant (Silphium perfoliatum)
Cup Plant (Silphium perfoliatum)

Cup Plant (Silphium perfoliatum)

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Silphium perfoliatum
Cup plant makes an unmistakable presence in large rain gardens & moist meadow plantings. It is exceptional for wildlife, especially goldfinches and other birds that eat cup plant seeds. The leaves form "cups" on the stem; these cups will hold water from which birds will drink. In large stands of cup plant, birds will take refuge from the sun and heat by hiding in the foli

Uses: Birds, pollinators, rain gardens, bees, butterflies
Bloom time: July - September

Height: 6 to 8 feet
Space: 2 to 3 feet

Light: Full sun to light shade
Moisture: Average to moist

Seed:  Harvest September/October. Six to eight weeks of cold-moist stratification will help germination--sow seed November - January.
  • 1,800 seeds per ounce
  • 1 ounce per 100 square feet
  • 20 pounds per acre
5 Stars
Goldfinch Magnet
A large, and somewhat imposing addition to my natives. The profusion of yellow flowers attracts countless goldfinches, bees, and skippers. Some wasps and yellow jackets like to hang around due to the water being trapped in the cups so you may not want it too close to patio furniture. It usually flops over after it blooms. The kids love using the square stalks as spears. As a bonus, the finches clear out the aphids on a nearby swamp milkweed.
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Reviewed by:  from Ballwin, Mo. on 2/18/2018

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