Persicaria bistorta Superba - Bistort

The Polygonum bistorta Superbum or Persicaria Bistorta Superba is a perennial plant found near watercourses. It forms a fairly compact, dense, and upright clump. This robust plant spreads rapidly and is frost-resistant. From May to June, it produces compact cylindrical spikes measuring 5 to 7 cm (2 to 3in) long, containing numerous small flowers measuring 2 to 5 mm (0in) long. These lovely flowers are a soft pink and last a long time.

The generous clump of Bistort Knotweed consists of large semi-evergreen leaves measuring 10 to 30 cm (4 to 12in) long. The foliage is a vibrant green with strong veins on the undersides of the leaves. The leaves are ovate with undulate margins. At the water's edge, this charming clump floats on the surface of the water. Native to Europe, Central Asia, and Western Asia, it is a Bistort found along the banks of watercourses or in large bodies of water such as ponds. It also suits flowerbeds.

At maturity, this perennial can reach a height of 70 cm (28in). It can be paired with Miscanthus and Lysimachia clethroides. Boxwood (Buxus sempervirens) also pairs well with Knotweed. The rhizomes of Polygonum contain saponin, tannins, and potassium nitrate, which have pharmaceutical properties and are used, among other things, in cases of hemorrhage.