Worth planting for its foliage alone, Silphium laciniatum also is striking in flower

Silphium laciniatum

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sillac
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Description
A gargantuan perennial from the American Prairie, compass plant owes its common name to the north/south orientation of its huge, deeply incised leaves, whose flat surfaces face east and west. Yellow daisy flowers open on massive 6- to 9-foot stems that arise in midsummer. Zone 3. Propagated from plugs. Deep 3.5-inch pots. Photo: cultivar413, is licensed under CC BY 2.0