Persicaria polymorpha - Knotweed
Persicaria polymorpha - Knotweed
Persicaria polymorpha - Knotweed
Persicaria polymorpha - Knotweed
Persicaria polymorpha - Knotweed
Persicaria polymorpha - Knotweed
Persicaria polymorpha - Knotweed
Persicaria polymorpha
Well, a Policarpa polymorpha is not a knotweed. I hope I didn’t get a knotweed because knotweeds produce suckers, which is not the case with the polymorpha. We’ll see. Otherwise, the young plants arrived in good condition.
Christelle , 27/05/2025
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This plant carries a 12 months recovery warranty
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We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
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Description
Persicaria polymorpha forms a large clump which does not sucker, 2m (7ft) in height, covered in midsummer with countless branched, pure white spikes of flowers.
This large perennial forms a powerful and thick stump, but does not sucker. Upright and robust stems emerge from this stump in spring, carrying a large lanceolate, bright green foliage, forming a large loose bush. In summer, Persicaria polymorpha bears countless flowers in long and large corymbs, pure white with a strange ammonia-like scent.
Hardy to -20°C (1°F) and easy to grow, Persicaria polymorpha thrives in full sun or partial shade, it grows in rich, heavy, damp to moist soils. Plant it in the back of a border, in a lush and exotic garden alongside Gunnera, Astilboides tabularis, Chinese palm and Filipendulas.
Persicaria polymorpha - Knotweed in pictures
Flowering
Foliage
Plant habit
Botanical data
Persicaria
polymorpha
Polygonaceae
Cultivar or hybrid
Other Persicaria
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Planting and care
Grow Persicaria polymorpha in moist and clay soil, in full sun or partial shade. The plant has a slow growth and initially forms a strong stump during the first few years of cultivation, from which large stems will emerge.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
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The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:
- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.