Persicaria bistorta 'Superba'


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Key information

Plant type

Hardy perennial

Flower colour



Flowers, Dramatic foliage



Skill level


photo by Richard Bloom, copyright GAP Photos (41047)

Plant details

With a decent flowering period from late spring to midsummer, the vigorous Knotweed is an excellent choice for the damp garden. The bottlebrush-like, tiny mauve-pink flowers are packed tightly together on thin stems, above the dock-like foliage. The best planting position is at the edge of a pond or in a bog garden, where it quickly spreads forming impressive colonies up to 1m wide. 'Superba' is better than the species because it has larger flowers. It has been given the Award of Garden Merit (AGM) by the Royal Horticultural Society.

Family: Polygonaceae

Genus: Persicaria

Species: bistorta

Cultivar: Superba

Plant type: Hardy perennial

Flower colour: Pink

Foliage colour: Mid-green

Feature: Flowers, Dramatic foliage

Sun exposure: Full sun, Partial shade

Soil: Well-drained/light, Clay/heavy, Acidic, Moist, Boggy

Hardiness: Hardy

Skill level: Beginner

Height: 75cm

Spread: 100cm

Time to divide plants: September to November

Reader reviews


I use your tips and ideas for my garden. I moved to my new house 3 years ago but only just getting started here. I used all your help for my old house garden and after 13 years there my garden was a haven for insects, animals and me. Thank you.

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