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Persicaria affinis 'Darjeeling Red' (Knotweed)
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A mat-forming, semi-evergreen perennial with large, elliptic to lance-shaped, dark green leaves and, from midsummer to mid-autumn, erect spikes of pink flowers that turn red as they mature.
Height 30cm (1ft), Spread 50cm (1.5ft), 5-10 years to maturity.
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