Thunbergia alata
Thunbergia alata
Thunbergia alata
Thunbergia alata
Black-eyed Susan, Clock vine
Ultra-fast delivery to the pickup point, the young plants experienced no stress, they were fresh and healthy. I recommend this seller for their expertise and the quality of their service.
Heureshindoues, 16/04/2026
Back-to-school special offer!
Get €10 off for every €50 you spend! And get up to €40 off on a single order.
How does it work?
1. Shop your favourites
Add your favourite plants to your basket. For every €50 you spend (excluding delivery charges, store credit and the plastic-free option), you’ll receive a €10 voucher.
€50 spent = €10 voucher
€100 spent = €20 voucher
€150 spent = €30 voucher
€200 spent = €40 voucher
2. Place your order
Once your basket reaches one of the spending thresholds, place your order. You can even choose your delivery date!
3. Receive your voucher
As soon as your order has been shipped, you’ll receive an email containing your personal voucher code and its value.
4. Use it on your next order
Your voucher is valid for 90 days from the date you receive it. It can be used once only, on a new order worth at least the value of the voucher, excluding delivery charges.
Please note: Vouchers can be combined with other offers, but cannot be split or refunded.
Why not try an alternative variety in stock?
View all →
Available in 1 sizes
Available in 1 sizes
This plant carries a 12 months recovery warranty
More information
We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
Would this plant suit my garden?
Set up your Plantfit profile →
Description
The Thunbergia alata, or Black-eyed Susan, is a climbing plant cultivated as an annual for its cheerful yellow flowers with black centres that bloom abundantly throughout the summer. With rapid growth, a small green plug plant will reach 2m (7ft) in just one season. Its stems, covered in lush foliage, cling to trellises and fences, allowing for the quick creation of large and decorative pots or astonishing hanging baskets that can be kept in the conservatory. The Black-eyed Susan enjoys heat and sun, as well as fertile, moist, and well-drained soil.
The Thunbergia alata, is a fast-growing perennial and voluble climbing plant that can only tolerate light frosts. It is a species native to tropical regions of East Africa, usually grown as an annual in our climates. The Black-eyed Susan reaches a height of approximately 2m (7ft) in just a few months, up to 3m (10ft) in open ground. Its slender, quadrangular, hairy, and purplish stems wrap around their support. They are adorned with lush, dark green foliage, consisting of evergreen (except in frost) hairy leaves with serrated edges, heart or arrow-shaped, measuring 4 to 8cm (2 to 3in) long. They are attached to the stems by an axillary petiole. Flowering occurs from June-July to October. The 3-4cm (1-2in) flowers, surrounded by a hairy calyx, are borne on peduncles in the axils of the leaves. The corolla is tubular at the base and extends into five flared lobes. The flowers are an intense and pure yellow, very warm in colour. In the centre of this flower shines a beautiful and characteristic dark purplish eye, whose role is to attract pollinating insects.
The Black-eyed Susan is suitable for both container and open ground cultivation, in sunny locations. A voluble climber, but lightweight, it pairs well with a perennial climber such as Clematis heracleifolia 'Côte d'Azur' and can also be used as ground cover. You can combine it with summer-flowering bulbs, such as Crocosmias and gladioli: it will twist around the leaves and bloom in the most unlikely places, adding whimsy to somewhat rigid borders. It will also have a great impact in a large container or hanging basket.
Green plug plants measuring 4 to 8cm (2 to 3in), in packs of 5 small plugs, 3.6cm (1in) in diameter and 4cm (2in) in height. Our plants are at least eight weeks old and strong enough to be planted in open ground.
Note: Please be aware that our young plug plants are professional products intended for experienced gardeners: upon receipt, repot and store them in sheltered areas (conservatory, greenhouse, cold frame etc) at a temperature above 14°C (57.2°F) for a few weeks before planting them outdoors once the risk of frost has passed.
Thunbergia alata in pictures
Plant habit
Flowering
Foliage
Botanical data
Thunbergia
alata
Acanthaceas
Black-eyed Susan, Clock vine
East Africa
Planting and care
You can plant your Thunbergias alata in the ground or in a pot. If you plant them in the ground, wait until the last frosts have passed (Thunbergias cannot tolerate frost and do not cope well with temperatures below 8°). In the meantime, you can pot them up them in a pot in a warm and bright place to accelerate their growth. Plant your Black-eyed Susans in a sunny location. They need a light and humus-rich soil. They tolerate short periods of drought quite well, but will need regular watering during hot summer periods to flower well. In pots, they need to be watered very regularly. Remember to provide support if you use them as climbing plants. Usually grown as annuals, they are actually very tender perennials: by bringing them indoors in September, you can extend their flowering into autumn and winter.
Planting period
Intended location
Care
Planting & care advice
-
-
-
-
-
-
-
-
-
, onOrder confirmed
Reply from on Promesse de fleurs
Recently viewed products
Haven't found what you were looking for?
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.