Thunbergia erecta — an easy houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Thunbergia erecta

Thunbergia Erecta

Updated · 1,311 observations
A NOTE OF INTEREST

Thunbergia erecta, commonly known as Bush Clock Vine or King's Mantle, is a tropical evergreen shrub in the Acanthaceae family. Native to Africa and Madagascar, it has gained popularity worldwide for its attractive flowers and foliage.

This plant can reach up to 2 meters in height and has a bushy growth habit. Its dark green leaves are ovate or lanceolate in shape. The trumpet-shaped flowers, consisting of five petals, come in a variety of colors including white, yellow, orange, pink, or purple, depending on the cultivar.

Thunbergia erecta is a favored ornamental plant used in landscaping because of its vibrant blooms, which attract butterflies and hummingbirds. It can be grown either as an annual or perennial, depending on the climate zone.

This low-growing, bushy shrub originates from the tropical regions of Africa. It produces an abundance of vividly colored purple flowers. In areas without frost, it acts as a perennial, but it can also be kept in a greenhouse during winter in colder climates. Its dense foliage and stunning blooms make it an excellent choice for a border or hedgerow. FUN FACT · FROM THE LIBRARY

The plant thrives in full sun but can tolerate partial shade. It requires well-drained soil and regular watering during dry periods for optimal growth.

In traditional African and Asian medicine, Thunbergia erecta has been used to treat various ailments such as fever, coughs, and colds, due to its anti-inflammatory properties.

Overall, Thunbergia erecta is a visually appealing ornamental shrub that enhances any garden with its colorful flowers, while also offering medicinal benefits.

THE NAME

Bush Clockvine, also known as Thunbergia erecta, is a plant that differs from typical clockvines. While most clockvines are named for their clockwise growth pattern around fence posts or trellises, the bush variety grows in a sprawling manner instead of climbing. The genus name, Thunbergia, honors the Swedish botanist Carl Thunberg, who lived from 1743 to 1828.

A note from PlantMom

Bush clockvine is resistant to diseases and is generally not likely to develop them. Regarding care, the plant is fairly low-maintenance. When grown outdoors it needs only minimal watering, and larger specimens usually do not require pruning. Smaller plants, however, should be pruned after they have finished blooming. Bush clockvine is appropriate for anyone with an outdoor area, such as a garden or deck, and does not demand much gardening experience.

— PlantMom
CARE GUIDE

How to keep Thunbergia Erecta.

Light

Bush clockvine flourishes in locations with plentiful sunlight yet can tolerate dappled light. Native to sun-drenched habitats, the plant may experience stunted growth or develop leaf scorch if it lacks adequate light or is exposed to excessively intense light.

Water

The bush clockvine, native to tropical West Africa, thrives in environments with high humidity and consistent moisture. To keep it healthy, water the plant every 1-2 weeks, making sure the soil remains moist but not waterlogged. During the growing season, it's important to water carefully to ensure the plant maintains its lush foliage.

Temperature

Bush clockvine originates from areas with a temperate climate. It does best in temperatures of 50 to 90 °F (10 to 32 ℃). In winter, move it to a warmer place if temperatures fall below 50 °F (10 ℃).

Fertilizer

Timing is vital for fertilizing Bush clockvine. Fertilize in early spring and then monthly through early summer. Fertilizer promotes attractive blooms and supplies energy during both dormant periods and active growth phases.

Pruning

Bush clockvine is a perennial plant known for its bushy appearance and beautiful blue-violet flowers. To ensure healthy growth and a vibrant display throughout the growing season, it's important to prune the plant in early spring. Start by removing any damaged stems, and then shape the plant to improve growth, air circulation, and light penetration. Regular pruning not only helps control the plant's size but also maintains its form.

Pot & Repot

The bush clockvine grows best in pots with excellent drainage, which is essential for its healthy growth. Good drainage prevents waterlogging, encouraging strong root development and promoting overall plant vitality.

CHARACTERISTICS

Botanical profile.

Plant Type
Vine, Shrub
Life Cycle
Perennial
Genus
Thunbergia
Family
Acanthaceae
Hardiness Zone
6-8
Mature Height
2.44 m
Mature Spread
1.52 m to 2.44 m
Leaf Color
Green
Leaf Type
Evergreen
Flower Color
Purple
Flower Size
2.54 cm to 5.08 cm
Bloom Time
All year round
Planting Time
Spring, Autumn
Harvest Time
Spring, Summer, Fall
Native Area
Rwanda, Nigeria, Guinea-Bissau, Uganda, Tanzania, Benin, Sierra Leone, Cameroon, Liberia, Ghana, Central African Republic, Congo, Sudan, Guinea, Chad, Senegal, Côte d'Ivoire, Congo (DRC), Gabon
ALSO KNOWN AS

Other names.

en Bush Clockvine en King's-mantle en Kings mantle en Purple bell en Terumpetan Ungu
FREQUENTLY ASKED

Reader questions.

How should I water my Bush clockvine plant?

Here are some tips for watering your plants effectively: 1. Place a garden hose near the base of the plant to promote good root development. Avoid spraying the leaves directly, as this can be detrimental. 2. If your plants are outdoors and exposed to direct sunlight, the leaves will require more water. Keep this in mind when watering. 3. Consider using bubblers for each plant to ensure the roots are thoroughly moistened. 4. Soaker hoses are another option, especially for larger garden beds. They can cover the entire area and help the roots grow deeper. Remember to adjust the hose when adding or removing plants. 5. After watering, make sure to drain any excess water and allow the soil to dry before watering again. This helps prevent overwatering. 6. Watering at ground level is best to prevent the occurrence of diseases. 7. On a sunny day, it may be beneficial to spray the entire bush with water. 8. Whether your plant is in a pot or planted in the ground, keep in mind that Bush clockvine prefers deep watering rather than light sprinkling.

Why should I put fertilizer on my Bush clockvine?

Fertilizing your Bush clockvine is important for several reasons. One of the most obvious is that it helps the plant produce beautiful blooms. It is best to fertilize in early spring to ensure excellent flowers during the season. Additionally, fertilizer provides the plant with energy that can be stored in the ground during dormant phases. Adding nutrients during fall planting or late spring will help the plant hold more energy for when active growth resumes.

What are the sunlight requirements for Bush Clockvine?

Bush Clockvine thrives best in environments with a lavish display of the sun's warmth, requiring full sun conditions of above 6 hours of sunlight daily for optimal growth. However, it can also tolerate partial sun conditions, about 3-6 hours of sunlight. It's essential to watch how sunlight moves through your garden, choosing spots that provide the right balance of light and shade for your plants. Insufficient sunlight or excessive exposure can cause issues like stunted growth or leaf burn, respectively.

What are the essential care instructions for Bush clockvine?

Bush clockvine, botanically known as Thunbergia erecta, originates from environments with a temperate climate, thriving best at temperatures between 50 to 90 °F (10 to 32 °C). It possesses strong cold resistance, so special frost protection measures usually aren't required, except in cases where winter temperatures are expected to drop below -25°C. To prepare for winter, it's recommended to move the plant to a warmer location if temperatures are anticipated to drop below 50 °F (10 °C), water the plant abundantly before the first freeze in autumn to ensure the soil remains moist and enters a frozen state. If extremely low temperatures are expected, wrapping the trunk and branches with non-woven fabric or cloth can provide necessary cold protection.

What should I do if I give too much or too little water to Bush clockvine?

If an overwatered Bush clockvine begins to show yellow leaves that drop off and wilt, as well as signs of mushy stems, it's important to adjust your watering schedule. Wilting can also be a sign of under watering, indicated by crispy and dry leaves. In such cases, check the soil for dryness and provide a thorough watering. However, even with enough water, the plant may still appear dry with yellow leaves due to root damage. Once the plant recovers, the yellowing leaves will stop. When keeping the Bush clockvine indoors, regularly check the moisture levels and avoid overwatering. If black spots appear, allow the soil to dry out for a few days. Overwatering can lead to root rot, so if discolored and slimy roots are present, consider transferring the plant to a different pot. Take care to prevent root rot and avoid excessively soggy soil. When planting the Bush clockvine outdoors, ensure that the soil is adequately moist. If it is too dry, this may indicate underwatering. In this case, provide sufficient water to aid in the plant's recovery.

When should I fertilize my Bush clockvine?

Fertilizing Bush Clockvine requires careful timing. If you fertilize too early while the plant is still dormant, the fertilizer won't be effective and will be washed away by rainwater, leading to waste and pollution. To start, apply the first round of fertilizer in early spring. Then, continue fertilizing once a month until early summer.

How does artificial lighting benefit Bush Clockvine indoors?

Indoor Bush Clockvines require adequate lighting for optimal growth, especially when natural sunlight is insufficient, such as in winter or less sunny spaces. Artificial lights, like LED lights that can be customized to provide specific wavelengths, offer a vital solution. For full sun plants like Bush Clockvine, 30-50W/sq ft of artificial light is recommended, placed 12-36 inches above the plant and turned on for 8-12 hours per day to mimic natural daylight hours and promote faster, healthier growth.

How does low temperature affect Bush clockvine and what can be done?

Bush clockvine is cold-tolerant, performing optimally when temperatures remain above 10°C, and it should be kept in conditions above -15°C during winter. If temperatures fall below -25°C, the plant may not show immediate distress, but come spring, branches may become brittle and dry, and new shoots might fail to emerge. To mitigate this, in spring, prune away any dead branches that have not produced new leaves, facilitating healthier growth.

How often do I need to water my Bush clockvine?

The Bush clockvine prefers deep watering, especially if planted in pots. Since pots have limited water storage, the soil dries out quicker, so it's essential to water every 3 to 5 days in cold regions. Watering should be done early in the morning when the soil is dry, both for indoor and outdoor plants. To check if watering is needed, you can assess the soil moisture. When the top 2-3 inches of soil are dry, it's time for a full watering. On hot days, monitor the moisture daily to prevent the soil from drying out rapidly. If you have a garden, irrigation is necessary, especially in hot climates. Watering once a week is sufficient when about 2 to 3 inches of soil appear too dry. However, do not water if rainfall is already abundant to avoid root rot. Bush clockvine typically grows during spring and fall, so adding mulch 3 to 4 inches deep around outdoor plants helps conserve water. Sandy soil requires more frequent watering due to faster drainage, while clay soil needs less frequent watering to prevent root rot. To keep track of watering, mark the dates on a calendar and pay attention to drooping leaves, which can indicate that you may need to water sooner.

When is it not a good idea to fertilize my Bush clockvine?

To ensure proper blooming of Bush clockvine, it is important to avoid using fertilizers with excessive nitrogen. These can result in an abundance of leaves but few blooms. Instead, opt for fertilizers with lower nitrogen content compared to other nutrients. Additionally, it is advisable not to fertilize the plant after early autumn, as this may cause excessive growth right before winter. Furthermore, refrain from fertilizing Bush clockvine during hot and dry periods since dry soil does not effectively deliver fertilizer, and stimulating growth at such times may require more water than available. It is best to apply fertilizer during cooler temperatures earlier in the season. Lastly, be mindful that Bush clockvine can absorb fertilizers applied to nearby plants or lawns, so be careful not to unintentionally over-fertilize the plant.

What are the symptoms of inadequate lighting for Bush Clockvine?

Bush Clockvine may show several symptoms when exposed to suboptimal lighting conditions. These include smaller new leaves, leggy or sparse growth, early leaf drop, slower or halted growth, lighter-colored new leaves indicating a lack of chlorophyll, chlorosis (leaf yellowing), sunscald, leaf curling (to minimize water loss and damage from sun), wilting from excessive transpiration, and leaf scorching. These symptoms highlight the plant's struggle in non-ideal light conditions.

What should be done if Bush clockvine experiences high temperatures?

In summer, it's crucial to ensure the Bush clockvine doesn't endure temperatures above 32°C. Exposure to temperatures over 35°C may result in lighter-colored leaves, dry and withered tips, and an increased susceptibility to sunburn. To help the plant recover, trim away any sunburned and dried parts. Moving the plant to a shaded location during the midday and afternoon sun or utilizing a shade cloth can also protect it. Additionally, watering the plant in the morning and evening will help keep the soil moist and reduce stress on the plant.

PLATES
Thunbergia erecta leaf
PLATE 01 · leaf
Thunbergia erecta leaf
PLATE 02 · leaf
Thunbergia erecta flower
PLATE 03 · flower
Thunbergia erecta flower
PLATE 04 · flower
Thunbergia erecta fruit
PLATE 05 · fruit
Thunbergia erecta bark
PLATE 06 · bark
ALSO IN THE LIBRARY

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