culver's root Veronicastrum virginicum
Photo: John Glover/Alamy
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Culver's Root

(Veronicastrum virginicum)

These tall, slender plants add height to summer borders. The narrow spires of 'Lavendelturm' are covered with pale purple flowers from late summer to early fall. Full sun to partial shade. Up to 5 feet high, 2 feet wide. Zones 3 to 8.
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