Persicaria runcinata Purple Fantasy - Knotweed
Persicaria runcinata Purple Fantasy - Knotweed
Persicaria runcinata Purple Fantasy - Knotweed
Persicaria runcinata Purple Fantasy - Knotweed
Persicaria runcinata Purple Fantasy - Knotweed
Persicaria runcinata Purple Fantasy - Knotweed
Persicaria runcinata Purple Fantasy
Knotweed
I love its form. I hope it will take well—it's off to a good start.
Brigitte , 28/03/2026
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Description
Persicaria runcinata 'Purple Fantasy' is a variety of knotweed or persicaria, it forms a carpet of very unique leaves, triangular in shape, with shades of green, marked with a brown V in the center, and edged with silver. The white summer flowering occurs in small clusters. This fast-growing perennial can tolerate slightly challenging conditions, in moist soil, in full sun or partial shade.
Persicaria runcinata 'Purple Fantasy' is a plant from the family Polygonaceae, with origins in the Himalayas, which gives it good hardiness and ease of cultivation. It is a perennial that forms a 50 cm (20in) tall carpet that spreads rapidly. This plant produces suckers, but without ever becoming invasive. One plant forms a carpet of about 1m² in 5 to 6 years, composed of thin branches like wire, bearing unique small leaves. Remarkably decorative, the foliage is in the form of small elongated triangles, with shades of green edged with silver and highlighted with a brown V in the center of the lamina. The green areas turn purple later in the season. This knotweed produces spikes composed of tiny white flowers, much appreciated by bees, at the axil of the leaves, located at the end of the stems, from July to September, or even October. Note that the name of this plant Persicaria runcinata is somewhat uncertain and it also exists under the name 'Yunnan's Giant'.
Very cold-resistant, Persicaria 'Purple Fantasy' grows in any exposure, as long as the soil is moist and rich. Note that it tolerates heavy and wet soils very well. It will fit well in contemporary gardens as well as in gardens with a wild look, and will form colorful patches with Geranium macrorrhizum, Ajuga reptans or Lamium maculatum. Thanks to its spreading habit, it can be used as a ground cover, making sure to leave enough space for it. It can be grown equally well on sunny pond banks or in a cool and semi-shaded woodland area at the base of trees.
Persicaria runcinata Purple Fantasy - Knotweed in pictures
Flowering
Foliage
Plant habit
Botanical data
Persicaria
runcinata
Purple Fantasy
Polygonaceae
Knotweed
China
Planting and care
Persicaria 'Purple Fantasy' thrives in any exposure. It is a very easy plant to grow, it even tolerates a moderate period of drought if the soil is deep. Plant it in any type of soil, as long as it is moist and humus-bearing. Plant it in spring or autumn, in groups to create an immediate mass effect. Enrich the soil with organic fertilizer at the start of the growing season, as it is quite voracious. Mulch the soil in June in regions where the summer is hot and dry.
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).
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 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.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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