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Silphium perfoliatum Cup Plant

Ohio Native Plant Natural Range

To view the natural range of Silphium perfoliatum visit the USDA Natural Resources Conservation Service website.
You will notice a diverse group of pollinators visiting Cup Plant

Cultivation Information Cup Plant

Perfoliate leaves of cup Plant hold water for birds and insects
Height - 6 to 7 ftFlower Color - YellowBlooms - July - SeptSun - SunPerennial Hardy Zone - 4 to 8Soil - Moist to wetpH - 6.1 to 7.4
Natural Fence - A mature grove of Cup Plants are perfect native plants for "green" privacy fences
Family - Asteraceae
Seed not quite ready to harvest
Seed Provenance Silphium perfoliatum
Prairie Moon Nursery, Winona, MN 2012 - Nodding Onion Gardens 2013 to present
When designing a "green fence" Cup Plants are a fantastic choice.

Wildlife Significance Cup Plant

Host Plant - Silphium Moth Water - Perfoliate leaves hold water for a wide variety of wildlife
Pollen - bumblebees, green sweat bees, sweat bees, long horned bees and leafcutter bees
Nectar - Wasps, bee flies, various short-tongued bees along with butterflies and skippers
Aphid Predators - Both Lady beetles and Brown Lacewing inhabit the leaves of the Cup Plant, both devour pesky aphids.
Katydids - Camouflage is the name of their game, but take a closer look, and you might discover a katydid munching on the Cup Plant's thick green leaves
Seed - Birds - Chickadees, Goldfinches, sparrows along with a host of other songbirds love Cup Plant seeds!
For more details, visit the Illinois Wildflower website.
Goldfinches feasting on Cup Plant By Paula and Ken Korber
Propagation Notes Cup Plant
Dried Silphium perfoliatum seeds
Stratifying Seeds
1. Zip lock plastic bag2. Few tablespoons of Vermiculite3. Dampen vermiculite - not soggy4. Store seed in refrigerator for 60 days Seeds require cold moist storage in order to germinate Alternative Methods - Look for young seedlings under previous years plants, there should be an abundance. Or fall sow in an outdoor cold frame. It is best to cover them well with potting soil, making it more difficult for small mammals like mice to discover them.
Ohio Department of Agriculture Nursery Inspection 2010 - 2023
© 2023 Nodding Onion Gardens, LLCColumbia Station, Ohio 44028I

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