Botanical Name: Silphium laciniatum
Height: about 2 m
Season of bloom: August and September
Growing Conditions: Full sun. Well-drained soil. Extraordinarily deeply tap-rooted and so difficult to grow in pots.
From Ottawa Valley or eastern Ontario sources: No. Species occurs in the wild in southwestern Ontario where it is considered provincially rare.
Remarks: Long-lived, slow to mature, and majestic.
Similar species: Prairie Dock, Cup Plant.
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