Silphium terebinthinaceum, Prairie Dock

Small yellow flower heads like sunflowers bloom at the ends of narrow stalks on this perennial. It takes at least two years to blossom. Once begun, it blooms August to October. Attracts birds and butterflies.

Grow specs: To 8 feet. Fertile, well-drained land or dry soils. Full sun. Stratify 30 days at 41 degrees F. or plant in fall.

$3.00

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