This is a huge late flowering herbaceous perennial - it can get to 7ft in height and spread in fertile soil. It's a great plant for the back of the border with its purple stems and pinky flowers. It looks great mixed in with late flowering grasses like miscanthus and cortaderia.
It prefers moist and fertile-ish soil and will grow in all but the most shady of sites.
You can divide it in spring.
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