Description from Possibility Place: Cup Plant is a tall prairie plant that produces panicles of large yellow flowers at the tips of its central stalk. Blooming period occurs early to mid summer and lasts a month to a month and a half. Its opposite leaves join together along the central stalk forming little cups that catch water. Birds are drawn the water source as well as the food source provided by its large seeds. Under ideal growing conditions, this plant will reseed readily and can become somewhat weedy.
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Click here for the native pollinators that feed on Silphium perfoliatum.