Contrasting duo of Persicaria amplexicaulis Blackfield and Alba
Contrasting duo of Persicaria amplexicaulis Blackfield and Alba
Persicaria amplexicaulis Blackfield, Alba
Knotweed
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Description
Revisit the garden with this duo of Persicaria amplexicaulis 'Blackfield' and 'Alba', flowering from summer to autumn in a beautiful contrast of deep purple-red and pure white. These robust perennial plants can reach a height of 1 to 1.2 m (3 to 4 ft) and have elegant green foliage that forms a beautiful backdrop for their flowers. The foliage is not evergreen and disappears in winter, but the plant can withstand temperatures as low as -20°C (-4°F). Prefers well-drained and slightly moist soil.
This duo consists of:
- 1 x 'Blackfield' knotweed: this cultivar stands out with its dark red flowers that catch the eye. The plant forms a clump of about 1.2 m (4 ft) in all directions, ideal for adding depth to a flowerbed.
- 1 x 'Alba' knotweed: this variety shines with its white flowers that add a touch of freshness and brightness. It is slightly smaller than 'Blackfield', reaching a height of about 1 m (3 ft), making it perfect for borders or small spaces.
When planting, it is recommended to place the taller 'Blackfield' knotweed at the back of the flowerbed to maximise its visual impact. The 'Alba' knotweed can be planted in front or to the side. For a beautiful density, plant 3 to 4 plants per m sq and make sure to maintain a distance of 45 to 60 cm (18 to 24in) between each plant.
To create a harmonious garden around this duo of Persicaria amplexicaulis, consider pairing them with plants that share their needs for well-drained soil and semi-shaded to sunny exposure. Asters, especially the variety Aster amellus 'King George', blend in perfectly with their autumn flowering in lavender blue. Helenium, particularly Helenium 'Moerheim Beauty' with their red-brown flowers, offer a captivating colour contrast during the same flowering period. Ornamental grasses like Miscanthus or Pennisetum will also bring texture and movement to the garden. Don't forget about Ferns, which with their delicate foliage create a beautiful backdrop for these perennials.
Flowering
Foliage
Plant habit
Botanical data
Persicaria
amplexicaulis
Blackfield, Alba
Polygonaceae
Knotweed
Cultivar or hybrid
Planting and care
Persicaria amplexicaulis thrives in sunny or semi-shaded exposure. It is a very easy plant to grow. Plant it in any type of soil, as long as it is moist and rich in compost.
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).
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.