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Sign up freeOenothera lindheimeri
flowerDelicate white or pink butterfly-like flowers on wiry stems that sway in the breeze. Long flowering season from late spring to autumn. Cut back hard in spring to encourage bushy growth.
Well-draining, average to poor — drought-tolerant once established
Knautia arvensis
flowerThrives in the same full sun, low water conditions as Gaura