This is a white cultivated variety of the more common pink one. Its speciality is that it will grow in dry and impoverished soil (including at the foot of trees) provided it has a sunny site.
It will also romp away and attain a great height (3-4ft) to form part of stunning perennial border in moderately fertile soil.
This plant responds very well to pinching the growing tip out in mid spring. This helps it produce a bushier plant with more flowers. It also benefits from a cutting back by a third after the first flush of flowers as it will re-flower in late summer.
As a cultivated variety this plant might not come true from seed but you can propagate clones by basal cuttings in early spring or root cuttings in late autumn.
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