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Cup Plant ( Silphium perfoliatum ) in Kitchener, Ontario, Canada.

Photo: Ryan Hodnett (CC BY-SA 4.0), via Wikimedia Commons

moderate water

Cup Plant

Silphium perfoliatum

Cup Plant (Silphium perfoliatum) is a landscape plant valued for its form and structure as much as its bloom. It reaches roughly 6 ft at maturity and blooms in late summer. Match it to full sun to part shade and water on a normal schedule until it is established. One caveat: like any plant, its published range is a guideline, not a guarantee, for the specific microclimate of your yard. Given a spot that matches its light and water needs, it is a dependable, low-drama addition to the yard.

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Hardiness range

A hardiness zone is not on file for this plant yet, and a ZIP-level fit check is not available for it.

How it does in your yard

HabitNot recorded
Hardiness zoneNot recorded
Mature heightAbout 6 ft
Watermoderate
Bloom periodLate Summer
Native to the USNot recorded
Toxicitynone

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Questions

Is Cup Plant native to the United States?

USDA PLANTS data does not record Cup Plant as native to the United States.

What USDA hardiness zone does Cup Plant need?

A minimum hardiness zone is not on file for Cup Plant yet.