Sedum Black Knight - Autumn Stonecrop
Sedum Black Knight - Autumn Stonecrop
Sedum Black Knight - Autumn Stonecrop
Sedum Black Knight - Autumn Stonecrop
Sedum Black Knight - Autumn Stonecrop
Sedum Black Knight - Autumn Stonecrop
Sedum Black Knight (‘Dolseb’)
Stonecrop
Very pretty and healthy plant. Perfect packaging.
Louise, 26/02/2026
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Description
Sedum 'Black Knight' is an interesting hybrid stonecrop with a natural resistance to powdery mildew. It is an incredibly decorative variety, with very dark, almost black foliage, which enhances its colourful pink-red flowering in September. It is a small, upright and bushy plant that has a great effect in well-drained borders and rockeries, in front of taller plants and bushes. This variety also performs well in pots. Give it a sunny location and well-drained soil, even dry and rocky. Hardiness: -15°C (5°F).
Sedum 'Black Knight' belongs to the Crassulaceae family, which includes many species of drought-tolerant succulent plants. The genus Sedum includes many allies for the garden, with varied shapes and colours. 'Black Knight' is a horticultural hybrid that was recently selected in France by Marie-France Doll.
The vegetation of Sedum 'Black Knight' emerges from the ground in spring, then dries up in autumn. It forms a small clump of leafy stems measuring about 50cm (20in) in all directions. The foliage is composed of small, thick, ovate, shiny leaves. They are dark purple, sometimes becoming black under certain lighting. The flowering takes place in September. At the end of the stems, flattened inflorescences form, composed of a multitude of dark purple flower buds that open into small pink-red star-shaped flowers. This flowering attracts many pollinating insects.
Sedum 'Black Knight' excels in rockeries or dry borders, and performs very well in shallow, even rocky soils. Its disease resistance means it can be easily grown in pots. You can place it alongside other stonecrops (Sedum sediforme, S. sexangulare), houseleeks (sempervivum), aubrietas or deltoid pinks (Dianthus deltoides 'Flashing Light'), for example. Also create a beautiful scene with silver basket, Nepeta mussini, and blue or pink agastaches.
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Sedum Black Knight - Autumn Stonecrop in pictures
Flowering
Foliage
Plant habit
Botanical data
Sedum
Black Knight (‘Dolseb’)
Crassulaceae
Stonecrop
Cultivar or hybrid
Planting and care
Plant Sedum 'Black Knight' in light, rather poor and stony soil. It will tolerate very dry soil. It must be well-drained to protect the roots from the cold moisture of winter. It can tolerate clay soils in regions with dry winters. Excessive fertilisation can distort this variety. Plant it in full sun to enhance the foliage colour. Once established, this plant is quite hardy. In pots, provide a layer of gravel for drainage. Divide the plant after 3 to 4 years to encourage vigorous growth and prevent it from thinning out in the centre and the lateral stems from collapsing onto the ground. Sedums are very easy to propagate. In spring, cut a stem or even a leaf and let it dry for a few days in the shade. Then, place it in a tray of moist sand.
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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