Silphium terebinthinaceum

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silter
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Prairie dock owes its common name to its enormous upright broadly oval basal leaves, which give the appearance of a mutant Rumex.  A spectacular foliage plant for large perennial borders, it also offers clusters of sunny daisy-flowers held elephant-high on thick stalks in summer.  One of the marvels of the American prairie.  Propagated from seed.  Deep 3.5-inch pots.  Zone 4.  Photo: Krzysztof Ziarnek, Kenraiz

Sun; humus-rich soil; 8'x4'; mid to late summer