Silphium terebinthinaceum
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Hardiness Zone: 4-8 Height: 1.0-3.0 metres; 3-10 feet Spread: 0.3-1.0 metres; 1-3 feet Sun: Full sun Water: Medium Wildlife: Hummingbirds and Goldfinches Tolerates: rocky soil; clay soil; drought Culture: Easily grown in average, medium, well-drained soils in full sun. Noteworthy Characteristics: Prairie dock forms a basal clump of huge oval to heart-shaped, dark green leaves (to 2' long) from which arise smooth, almost leafless stems topped with clusters of sunflower-like blooms (to 3