Black-eyed Susan (Thunbergia Alata ‘VOLTHU 1007’ SUNNY ARIZONA GLOW)

Plant: Table of Contents

Black-Eyed Susan (Thunbergia alata ‘VOLTHU 1007’ SUNNY ARIZONA GLOW) – A Comprehensive Guide


Gardening enthusiasts are often captivated by the vibrant and charming appearance of Thunbergia alata ‘VOLTHU 1007,’ commonly known as black-eyed Susan or Sunny Arizona Glow. This beautiful plant with its eye-catching flowers and easy-care nature has become a favorite for both novice and experienced gardeners.

In this comprehensive guide, we will delve into the intriguing world of black-eyed Susan, exploring its culture, uses, care requirements, and interesting facts. Whether you’re a seasoned gardener looking to enhance your landscape or a beginner eager to nurture your first plant, this guide will equip you with the knowledge and skills to cultivate and enjoy the beauty of Thunbergia alata ‘VOLTHU 1007.’

What is Black-Eyed Susan (Thunbergia alata ‘VOLTHU 1007’ SUNNY ARIZONA GLOW)?

Black-eyed Susan, scientifically known as Thunbergia alata, is a species of flowering plant in the Acanthaceae family. It is native to Eastern Africa, specifically Mozambique, and has gained global popularity as an ornamental plant due to its striking blooms and low-maintenance nature.

The ‘VOLTHU 1007’ cultivar, named Sunny Arizona Glow, is particularly renowned for its vibrant and cheerful flowers, which resemble the iconic black-eyed Susan blooms. This cultivar is prized for its ability to thrive in various conditions and its resilience in the face of different climates, making it a desirable choice for gardens and landscapes.

Key Takeaways

Before we dive into the details of caring for black-eyed Susan, let’s summarise the key aspects of this plant.

  • Scientific Name: Thunbergia alata ‘VOLTHU 1007’
  • Common Name: Black-eyed Susan, Sunny Arizona Glow
  • Family: Acanthaceae
  • Origin: Eastern Africa, specifically Mozambique
  • Cultivar: Sunny Arizona Glow (‘VOLTHU 1007’)

Now, let’s explore how to successfully cultivate and care for this delightful plant.


Understanding the cultural requirements of black-eyed Susan is crucial for ensuring its optimal growth and blooming. From water and sunlight needs to soil and fertilization, here’s what you need to know about the culture of Thunbergia alata ‘VOLTHU 1007.’


The versatile characteristics of black-eyed Susan make it suitable for various horticultural purposes. Its uses range from adding a pop of color to garden beds and borders to creating charming hanging baskets and container displays. Additionally, this plant is a great choice for attracting pollinators such as bees and butterflies, contributing to the overall biodiversity of a garden.


Black-eyed Susan exhibits moderate water needs, thriving best in consistently moist but well-drained soil. It is important to strike a balance, as overwatering can lead to root rot, while underwatering may result in stunted growth and poor flowering. During the growing season, regular watering is essential, particularly during dry periods. However, it’s important to allow the soil to dry out slightly between watering to prevent waterlogging.


One of the captivating features of black-eyed Susan is its preference for full sunlight. When provided with at least 6-8 hours of direct sunlight per day, this plant will flourish and produce an abundance of blossoms. In locations with intense afternoon heat, providing partial shade during the hottest part of the day can be beneficial. Adequate sunlight is crucial for promoting strong growth and an impressive display of flowers.


Applying a balanced and water-soluble fertilizer can contribute to the healthy growth and blooming of black-eyed Susan. During the growing season, a monthly application of a fertilizer with a higher phosphorus content can encourage prolific flowering. It’s important to follow the specific guidelines provided by the fertilizer manufacturer and to avoid over-fertilization, which can lead to excessive vegetative growth at the expense of flowers.


Black-eyed Susan thrives in well-drained, fertile soil with a slightly acidic to neutral pH (6.0-7.0). Amending the soil with organic matter such as compost or well-rotted manure can improve its overall structure and fertility, promoting robust growth and blooming. Additionally, the addition of a layer of mulch around the base of the plant can help retain soil moisture and suppress weed growth, benefiting the overall health of the plant.


Pruning plays a crucial role in maintaining the shape and vigor of black-eyed Susan. Regular deadheading – the removal of spent flowers – can prolong the blooming period and encourage the plant to produce more blooms. Additionally, the removal of weak or overcrowded stems can improve air circulation and reduce the risk of disease. Pruning can be performed throughout the growing season, as needed, to keep the plant looking tidy and healthy.


Black-eyed Susan can be propagated through various methods, including seeds, cuttings, and division. When propagating from seeds, it’s best to start indoors 6-8 weeks before the last expected frost, as this plant requires a long growing season to flower. For cuttings, taking 4-6 inch stem cuttings from healthy, non-flowering shoots and rooting them in a well-draining medium can yield new plants. Division, on the other hand, can be performed in early spring, separating the clumps and replanting them in suitable locations.

Container Popularity

The compact and trailing growth habit of black-eyed Susan makes it well-suited for container gardening. Its vibrant flowers and cascading foliage can add a touch of elegance to hanging baskets, window boxes, and mixed container arrangements. When cultivating black-eyed Susan in containers, it’s important to select a well-draining potting mix and ensure that the container has adequate drainage holes to prevent waterlogging.

Common Diseases

Black-eyed Susan may be susceptible to certain diseases, including fungal infections and foliar diseases. Keeping an eye out for symptoms such as leaf spots, powdery mildew, and stem rot is essential for prompt diagnosis and treatment. Proper cultural practices, such as watering at the base of the plant to avoid wetting the foliage and providing adequate air circulation, can help minimize the risk of these diseases.

Disease Diagnosis

Diagnosing diseases in black-eyed Susan involves careful observation of the plant’s appearance and performance. Symptoms such as discolored or distorted leaves, moldy growth on the foliage, and wilting can indicate potential diseases. By closely monitoring the plant and promptly addressing any signs of distress, gardeners can effectively diagnose and mitigate disease issues.

Common Pests

While black-eyed Susan is relatively resistant to pests, it may occasionally encounter challenges posed by aphids, spider mites, and whiteflies. These pests can cause damage by feeding on the plant’s sap, leading to weakened growth and foliage discoloration. Deploying insecticidal soaps or horticultural oils can help control and manage pest populations while minimizing the impact on beneficial insects.

Botanist’s Tips

Glean insights from botanists and horticultural experts to enhance your knowledge and skills in cultivating black-eyed Susan.

  • Encourage Pollinators: By planting black-eyed Susan alongside other pollinator-friendly plants, you can create a welcoming environment for bees, butterflies, and other beneficial insects.
  • Monitor Watering Closely: Pay attention to the moisture levels of the soil, particularly during hot and dry periods, to ensure that the plant receives adequate hydration without being overwatered.
  • Support Climbing Varieties: Certain varieties of black-eyed Susan can exhibit a climbing or trailing growth habit. Providing a trellis or support can help guide their growth and create an attractive vertical display.

Fun Facts

Uncover intriguing and captivating facts about black-eyed Susan to deepen your appreciation for this charming plant.

  • Black-eyed Susan is named after the cheerful yellow flowers with dark centers, resembling the eyes of the iconic Susan (a common name for women in the 19th century).
  • In its native habitat in Eastern Africa, Thunbergia alata can be found adorning forest edges and along riverbanks, showcasing its adaptability to various growing conditions.

Links to External Resources

Expand your knowledge and explore additional information about black-eyed Susan through reputable external resources.

  1. University of Florida IFAS Extension – Black-Eyed Susan
  2. Missouri Botanical Garden – Thunbergia alata

Plant Name: Black-Eyed Susan (Thunbergia alata ‘VOLTHU 1007’ SUNNY ARIZONA GLOW)

Nurture the vibrant beauty and charm of black-eyed Susan by providing it with the optimal care and attention it deserves. By understanding its culture, uses, and essential care requirements, you can cultivate a thriving and picturesque display of Thunbergia alata ‘VOLTHU 1007’ in your garden or landscape.

In the following sections, we will explore the specific care tips for black-eyed Susan, ensuring that you are equipped with the knowledge to foster its growth and beauty year after year.


  1. Ahmad, P., Rasool, S., Scarano, A., & Sofo, A. (2020). Endophyte-Mediated Disease Resistance in Sunflower: A Potential Role for Hormones and ROS-Scavenging Enzymes. In Sunflowers: Growth and Development, Environmental Influences and Pests/Diseases Control (pp. 125-143). Springer.
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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.