Silphium mohrii
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Silphium terebinthinaceum
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Silphium terebinthinaceum
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
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