Black eyed Susan (Thunbergia alata)

Black eyed Susan (Thunbergia alata) is an evergreen perennial vine that is grown as an annual. This tropical plant belongs to the acanthus family (Acanthaceae) and is found from East Africa to eastern South Africa. This plant thrives in warm climates and sunny locations. Thunbergia alata is a creeper or clumping vine that grows rapidly and produces seeds.
Under ideal conditions, the plant produces flowers and seeds year-round, reaching approximately 8 feet. These vines typically have bright orange heart-shaped flowers with black eyes. The plants generally bloom from midsummer until frost and attract butterflies, bees, and hummingbirds.

Overview for Thunbergia alata:

Scientific name: Thunbergia begin
Common name: Black eyed Susan vine, Thunbergia alata.
Plant type: Herbaceous perennial vine
Sun requires: Full sun
Soil: Well-drained, rich, moist soil
Blooming time: Mid-summer to Frost
Flower colour: Orange and yellow
Soil pH: 6.0 and 7.7
Hardiness Zone: 10-11

Growing Conditions of the Thunbergia alata vine

Light:
Black-eyed Susan Vine grows best in full sunlight but can tolerate partial shade. Provide it with 6 or more hours of full sunlight per day. Grow it in the shade in very hot climates, or its leaves will scorch.

Soil:
Thunbergia vine prefers fertile, well-drained, and rich, moist soil. This vine prefers slightly acidic to slightly alkaline soil (pH between 6.0 to 7.7). For better results, mix cow dung manure into the soil before planting and ensure proper drainage.

Watering:

These plants cannot tolerate drought; water them regularly, and this will promote plant growth and good flowering. It needs to be watered deeply so that water reaches the roots. These vines require consistent moisturebut the plant cannot tolerate excessive wetness.

Planting:

You can grow its seeds directly in the garden after the last frost is over. If you want flowers early, plant the seeds indoors 5-6 weeks before the last frost. Soak the seeds overnight to speed up germination.

Temperature:

In warm areas, these vines are perennial, but in some places it is grown as an annual. If you grow outside the hardiness zones, use a pot and move it to the shade during extreme winters. It can bloom easily if it gets enough sunlight in winter. Make sure the temperature does not go below 16 degrees.

Humidity:

These plants perform well in humidity, but excessively dry conditions may harm the plant; therefore, ensure the soil remains moist.

Fertilizer:

Black-edged Susan vine fertilized every 3-4 weeks during growing and flowering time. They do not need frequent fertilizing; you can use a balanced fertilizer to promote abundant flowering. Avoid over-fertilizing as this will cause the plant to grow, but the flowers will be fewer.

Propagation :

These plants are usually propagated by seed, although you can also propagate them from soft cuttings. Plants grown from seed grow more easily. Plant the seeds indoors 6 to 7 weeks before the last frost. Plant it outside when the temperature is above 16 degrees. Soak the seeds in warm water overnight; this will speed up germination. In winter, plant them in pots and keep them in a warm and lighted room.

Extra Care Tips:

Pruning:

Black eyed Susan vines require very little pruning. Deadheading is not a problem during the growing season. However, larger plants may require pruning to the desired size. Light pruning can also be done to promote optimal plant growth or flowering.

Support:

Black eyed Susan vine needs to be grown along a support to grow best, although it can also be used outdoors as a ground cover. For decoration, you can make it in any specific shape or use it on a wall or fence. Plant this vine near a fence or other supporting structure, space the plants apart, and prevent them from climbing through or over neighboring plants. Prune to maintain proper shape.

Pests:

Outdoor plants commonly have no pest problems, but indoor plants are susceptible to scale, spider mites, and whiteflies. Powdery mildew is a common problem that can affect the plant. It can be controlled by liquid soap or neem oil.

Read also:
8 Climber Plants for Wall Décor. How to Grow a Clerodendrum Plant. When and How to Grow Wisteria Plants. Flowering vines for a Balcony garden. 10 Best Annual Flowers for Full Sun. How to Grow Silver Pothos Plant.
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