Thunbergia Tangerine Slice - Black-Eyed-Susan
Thunbergia Tangerine Slice - Black-Eyed-Susan
Thunbergia Tangerine Slice - Black-Eyed-Susan
Thunbergia Tangerine Slice - Black-Eyed-Susan
Thunbergia Tangerine Slice - Black-Eyed-Susan
Thunbergia Tangerine Slice - Black-Eyed-Susan
Thunbergia alata Tangerine Slice
Black-eyed Susan
My young plants grew well on a hedge. The flowers bloomed mainly from late summer until the frosts.
jasper, 24/11/2025
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This plant carries a 6 months recovery warranty
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Description
The Thunbergia alata Tangerine Slice is a new variety of Winged Thunbergia that stands out for its two-tone shade and unusual flower pattern. Around a small centre, of an almost black violet which earned it the cute nickname Black-eyed Susan, each petal bursts into red-orange striped with ochre yellow, giving the corolla the appearance of a small star. Invasive perennial in its country of origin, it is an adorable annual climbing plant in our climates, appreciated for its original flowering that only ends with the first frost. Its stems covered with lush foliage cling alone to trellises, and allow for the quick creation of large, highly decorative pots or astonishing hanging baskets that can be kept in the veranda. It appreciates heat and sun, fertile, fresh, and well-drained soils.
Thunbergia alata is a perennial, fast-growing, and voluble climbing plant native to tropical regions of East Africa, which only tolerates very light frosts. For these reasons, it is grown as an annual in our climates. The cultivar 'Tangerine Slice' was recently obtained in the United States (Indiana). The plant reaches an average height of 2 metres in a few months. Its stems wrap around their support. They are covered with lush, dark green foliage, composed of evergreen (frost-free) villous leaves with dentate margins, heart-shaped or arrow-shaped. The leaves of this variety are slightly smaller than those of the usual varieties and slightly darker green. Flowering occurs from June to October. The flowers, measuring 3-4 cm (1.2 - 1.6 in), enclosed in a villous calyx, are borne on a peduncle in the axil of the leaves. The corolla is tubular at the base and extends into five flared lobes, laterally bordered by 2 yellow margins on a red-orange background. The colour of the flowers changes throughout the day, turning into a reddish-brown bordered by mustard yellow. In the centre of this flower shines a very beautiful eye, with a characteristic violet-black colour, whose role is to attract pollinating insects.
The Black-eyed Susan is suitable for container gardening as well as in open ground, in sunny locations. Voluble but lightweight climber, it pairs well with a perennial climbing plant like a herbaceous clematis and can also be used as ground cover. You can associate it with summer-flowering bulbs, such as gladioli: it will twist around the leaves and bloom in the most unlikely places, adding whimsy to rigid flower beds. It will also make a big impact in a large hanging basket.
Note: Please be aware that our young plants in mini-pots are professional products reserved for experienced gardeners: upon receipt, transplant and store them under shelter (veranda, greenhouse, cold frame...) at a temperature above 14C° for a few weeks before being installed outdoors once all risk of frost has passed.
Thunbergia Tangerine Slice - Black-Eyed-Susan in pictures
Flowering
Foliage
Plant habit
Botanical data
Thunbergia
alata
Tangerine Slice
Acanthaceae
Black-eyed Susan
Cultivar or hybrid
Planting and care
You can plant your Thunbergia alata Tangerine Slice in the ground or in a pot. If you plant them in the ground, wait until the last frost has passed (Thunbergia cannot tolerate frost and do not handle temperatures below 8° well). In the meantime, you can pre-cultivate them in a pot in a warm and bright place to accelerate their growth.
Plant your Thunbergia in a warm, sunny, or semi-shaded location. They need a light and humus-rich soil and warmth. They tolerate short drought periods fairly well, but will need regular watering during hot summer weather to flower well. In pots, they should be watered very regularly. Very floriferous and fast-growing, they reach 2m (6.6 ft) in a single season. Consider staking if you use them as climbing plants. Usually cultivated as annuals, they are actually very fragile perennials: by bringing them indoors in September, you can prolong their flowering into autumn and winter.
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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