Thunbergia (Thunbergia ‘Blue Glory’)

Plant: Table of Contents

Plant Profile: Thunbergia (Thunbergia ‘Blue Glory’)

Thunbergia, commonly known as Black-eyed Susan Vine, is a popular flowering plant loved for its vibrant blooms and ease of care. The ‘Blue Glory’ variety is particularly cherished for its striking blue flowers that add a pop of color to gardens, containers, and landscapes. In this comprehensive guide, we will explore everything you need to know about the thunbergia (Thunbergia ‘Blue Glory’), from its cultural needs and uses to propagation techniques and common diseases.

What is Thunbergia (Thunbergia ‘Blue Glory’)?

Thunbergia (Thunbergia ‘Blue Glory’) is a fast-growing tropical vine that is widely cultivated for its stunning, trumpet-shaped, bright blue flowers. This heat-loving plant is native to Africa, specifically from tropical areas such as eastern Africa down to South Africa. It belongs to the Acanthaceae family and is a favorite among gardeners for its ability to attract pollinators and bring vibrant color to any outdoor space.

Key Takeaways – Thunbergia (Thunbergia ‘Blue Glory’)

  • Scientific Name: Thunbergia ‘Blue Glory’
  • Common Names: Black-eyed Susan Vine, Blue Skyflower
  • Plant Type: Annual or tender perennial vine
  • Mature Size: 5-8 feet long
  • Sun Exposure: Full sun to part shade
  • Bloom Time: Summer to fall
  • Flower Color: Blue with dark centers
  • Hardiness Zones: 9-11
  • Native Area: Africa


Thunbergia ‘Blue Glory’ is relatively easy to grow and care for, making it an excellent choice for both experienced and novice gardeners. Let’s delve into the cultural aspects of this stunning plant.


This charming vine is versatile and can be used in various ways in your garden and landscape. Here are some of the common uses of Thunbergia ‘Blue Glory’:

  • Garden Borders: The vine’s cascading form makes it an ideal choice for adorning garden borders, adding a splash of color along the edges.
  • Hanging Baskets: Its trailing habit makes it perfect for hanging baskets, where its vibrant blooms can spill over the edges, creating a visually appealing display.
  • Trellises and Fences: Thunbergia ‘Blue Glory’ can be trained to climb on trellises and fences, adding vertical interest and a stunning floral display.
  • Container Gardening: Due to its compact size and cascading nature, it’s an excellent choice for container gardening, adding a pop of color to patios, decks, and balconies.
  • Groundcover: In suitable climates, the vine can serve as a groundcover, creating a carpet of vibrant blue flowers.


Thunbergia ‘Blue Glory’ prefers consistently moist soil, especially during the growing season. While it doesn’t tolerate waterlogging, it’s essential to keep the soil evenly moist but not waterlogged to promote healthy growth and prolific blooming.


For optimal growth and flowering, provide Thunbergia ‘Blue Glory’ with full sun to part shade. A minimum of 6 hours of sunlight is ideal for ensuring abundant and colorful blooms. In hotter climates, some afternoon shade can help protect the plant from scorching sun and promote prolonged flowering.


The plant benefits from regular feeding during the growing season to fuel its vigorous growth and abundant blooming. A balanced, water-soluble fertilizer applied every 2-4 weeks can help maintain the plant’s health and vigor.


Well-draining, rich, and loamy soil is preferred for Thunbergia ‘Blue Glory.’ A slightly acidic to neutral pH range (6.0-7.0) is ideal for promoting robust growth and prolific blooming.


Pruning Thunbergia ‘Blue Glory’ is relatively low maintenance. Regular deadheading of spent flowers can encourage continuous blooming and prevent the plant from setting seeds, redirecting its energy into producing more blooms.


Thunbergia ‘Blue Glory’ can be easily propagated through stem cuttings. Here’s a simple propagation method:

  1. Select a Healthy Stem: Choose a healthy side shoot from the parent plant with at least two nodes.
  2. Prepare the Cutting: Using a clean, sharp blade, make a clean cut right below a node and remove any leaves from the lower node.
  3. Rooting: Dip the cutting in a rooting hormone (optional) and plant it in a well-draining potting mix. Keep the soil consistently moist and place the cutting in a warm, bright location.
  4. Transplanting: Once the cutting has developed roots, it can be transplanted into a larger container or garden bed.

Container Popularity

Thunbergia ‘Blue Glory’ is highly popular for container gardening due to its trailing and cascading growth habit, making it suitable for hanging baskets, window boxes, and mixed container plantings. When grown in containers, it adds a touch of elegance and color to any outdoor space, making it a favorite choice among gardening enthusiasts.

Common Diseases

Thunbergia ‘Blue Glory’ is generally resilient to diseases, especially when grown in favorable conditions. However, like any plant, it can be susceptible to a few common diseases. Let’s explore some potential issues and how to address them.

Disease Diagnosis

Here are a few common diseases that can affect Thunbergia ‘Blue Glory’:

  • Powdery Mildew: A white, powdery coating on the foliage, often caused by humid conditions and poor air circulation.
  • Botrytis Blight: Gray mold that affects the flowers and foliage, particularly in damp and cool conditions.
  • Leaf Spot: Circular, dark spots on the leaves caused by various fungal pathogens.

Disease Prevention

To prevent diseases, it is essential to provide optimal growing conditions and practice good cultural habits, including:

  • Proper Watering: Avoid overhead watering and keep the foliage dry to reduce the risk of fungal diseases.
  • Air Circulation: Ensure adequate spacing between plants to promote air circulation and reduce humidity around the foliage.
  • Sanitation: Remove and destroy any affected plant material promptly to prevent the spread of diseases.

Common Pests

Thunbergia ‘Blue Glory’ is relatively resistant to pest infestations, but like any plant, it can encounter a few pests. Here are some common pests that may pose a threat to this vine:

  • Aphids: These small, soft-bodied insects can cluster on the new growth, causing distortion and discoloration of the foliage.
  • Spider Mites: These tiny pests can cause stippling and webbing on the leaves, often thriving in hot, dry conditions.
  • Whiteflies: These small, white, moth-like insects can aggregate on the undersides of the leaves, sucking sap and causing leaf yellowing.

Pest Management

Here are some effective ways to manage and control pests on Thunbergia ‘Blue Glory’:

  • Hose Off: Use a strong jet of water to dislodge and remove aphids, spider mites, and whiteflies from the foliage.
  • Neem Oil Spray: Apply neem oil, a natural insecticide, to the foliage to control and repel common pests.
  • Insecticidal Soap: Use insecticidal soap to target soft-bodied insects like aphids and whiteflies, ensuring thorough coverage of the affected plant parts.

Botanist’s Tips

As a plant scientist, I encourage you to consider the following tips to ensure the health and vibrancy of your Thunbergia ‘Blue Glory’:

  • Deadheading: Regular deadheading promotes continuous blooming by preventing seed formation and redirecting the plant’s energy into flower production.
  • Fertilizing: To ensure robust growth and prolific flowering, use a balanced, water-soluble fertilizer applied every 2-4 weeks during the growing season.
  • Air Circulation: Proper spacing and pruning can help improve air circulation, reducing the risk of fungal diseases such as powdery mildew and botrytis blight.

Fun Facts

To further pique your interest in Thunbergia ‘Blue Glory,’ here are some fascinating and fun facts about this delightful plant:

  • The genus Thunbergia is named in honor of Carl Peter Thunberg, a renowned Swedish botanist who made significant contributions to the field of botany.
  • Thunbergia ‘Blue Glory’ is known for its attractive, sky-blue trumpet-shaped flowers with a contrasting dark eye, creating a captivating display in any setting.
  • The plant’s climbing or trailing nature makes it a versatile choice for various garden and landscape applications, allowing for creative and artistic displays.
  • Thunbergia ‘Blue Glory’ is a magnet for pollinators, attracting butterflies, bees, and hummingbirds with its nectar-rich blooms, contributing to the biodiversity of the garden ecosystem.

Links to External Resources

To further enhance your knowledge and understanding of Thunbergia ‘Blue Glory’ and its care, cultivation, and uses, I recommend exploring the following external resources:

  1. Missouri Botanical Garden – Thunbergia alata

The Missouri Botanical Garden provides comprehensive information on Thunbergia alata, including its characteristics, growing conditions, and landscape uses.

  1. Royal Horticultural Society – Thunbergia

The Royal Horticultural Society offers valuable insights into different Thunbergia species, their cultivation, and garden suitability, providing expert guidance for successful growth.

  1. University of Florida IFAS Extension – Black-Eyed Susan Vine

The University of Florida IFAS Extension presents detailed information on the Black-eyed Susan Vine, including its attributes, growth requirements, and potential issues.

  1. The Spruce – Black-Eyed Susan Vine: Plant Care and Growing Guide

The Spruce offers a comprehensive guide to the Black-eyed Susan Vine, covering its care, maintenance, and creative uses in garden design.

  1. Gardening Know How – Growing Black-Eyed Susan Vines: Information About Black-Eyed Susan Vine Care

Gardening Know How provides practical advice on growing Black-Eyed Susan Vine, including care tips, propagation methods, and suitable growing conditions.

In conclusion, Thunbergia ‘Blue Glory’ is a delightful and versatile plant that adds an element of charm and color to diverse garden settings. With its captivating blue flowers, heat tolerance, and ease of care, it is a valuable addition to any garden, container, or landscape. By understanding its cultural needs, uses, and potential challenges, you can successfully cultivate and appreciate the beauty of this wonderful vine in your outdoor spaces. Whether adorning trellises, baskets, or garden beds, Thunbergia ‘Blue Glory’ has the potential to elevate the visual appeal and biodiversity of your garden while providing a haven for pollinators and wildlife. I hope this comprehensive guide has equipped you with the knowledge and confidence to cultivate and enjoy the splendor of Thunbergia ‘Blue Glory’ in your own gardening endeavors.

Remember to explore the links provided to further expand your understanding of this delightful plant and discover additional insights from reputable sources. Happy gardening and may your outdoor spaces flourish with the vibrant allure of Thunbergia ‘Blue Glory’!

Happy Planting! 🌿

Picture of Peter Taylors

Peter Taylors

Expert botanist who loves plants. His expertise spans taxonomy, plant ecology, and ethnobotany. An advocate for plant conservation, he mentors and educates future botanists, leaving a lasting impact on the field.