Dianthus barbatus (Nigrescens Group) 'Black Adder'
Dianthus barbatus (Nigrescens Group) 'Black Adder'
Dianthus barbatus Nigrescens Black Adder
Sweet William
The seeds start to germinate within 3 days under a mini greenhouse, which is great for quick planting. At the moment, half of the seeds have sprouted.
Cindy, 08/05/2023
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Description
Dianthus barbatus 'Black Adder' is an original selection of sweet William, with particularly dark colours. In this small plant, the leaves are tinted with metallic blackish red on a green background, and the purple stems bear flowers of a dark crimson red that turn black in full sun. They appear from May and can continue for 2 months if the faded stems are regularly removed. The cut flowers, pleasantly scented, are lovely in a vase. Very pretty with small coppery grasses like Carex comans 'Bronze'.
Dianthus barbatus is a plant of the Caryophyllaceae family found in many temperate regions of Europe and Asia. The nigrescens form, which originated the 'Black Adder' selection, is characterized by the mahogany or purplish colour with black metallic reflections of its vegetation and the intense chocolate red tone of its flowers. Not very perennial because not very hardy, it is mostly considered biennial, flowering in the second year after sowing. The plant forms a very tight basal clump in the first year, composed of long pointed leaves that sheath the stems at the base. Their purple-black colour is very elegant in winter, in a flowerless bed. The flowering of the 'Black Adder' selection takes place from May to July, depending on the sowing date. Its almost black flower buds, opening into single, velvety and fringed flowers, are gathered in flattened cymes, at the end of thin and sturdy purple stems that stand 40-50cm (16-20in) above the ground. The flowers are a deep red-brown, slightly more pink towards the center. They hold up very well in a vase. The fragrance of the flowers is both spicy and sweet, reminiscent of cloves and cinnamon.
Flowering
Foliage
Plant habit
Botanical data
Dianthus
barbatus
Nigrescens Black Adder
Caryophyllaceae
Sweet William
Cultivar or hybrid
Planting and care
Sow the seeds of the 'Black Adder' Sweet William indoors or in a greenhouse, from January to February as an annual with late flowering, or from June to July to see them bloom in spring.
Sow on the surface of a good quality and well-drained compost. Place the seed tray in a mini-greenhouse at a temperature of 15-20°C (59-68°F), or in a transparent polyethylene bag until germination, which takes 7-21 days. Keep the compost moist but not waterlogged and do not exclude light.
When the seedlings are large enough to handle, transplant them into 8cm (3in) pots and let the plants develop in cooler conditions. When all risk of frost has passed, gradually acclimatize them to outdoor conditions for 7-10 days before transplanting them outside. Maintain a distance of 30cm (12in) between plants, and plant them in any fertile, well-drained soil in full sun.
Sowing period
Intended location
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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