Family: Acanthaceae
Common names: Red Flame-Acanthus, Ceylon Pagoda Flower, Orange Pagoda Flower
Another beautiful plant that I saw in full bloom at TDU, The University of Trans-Disciplinary Health Sciences and Technology in Bangalore, Red flame Acanthus fascinated me at first sight. It resembles the Firecracker plant or Crossandra infundibuliformis, in the shape and structure of the flowers, but these plants are not related. Considering how beautiful these flowers are, I am surprised that the Red flame Acanthus is not a common garden plant.
Plant Characteristics
Red Flame-Acanthus is native to the Himalayan region and parts of Northeast India and Southeast Asia. It grows naturally in warm, humid climates and is often found along forest edges and in moist valleys. This plant thrives in tropical to subtropical weather where temperatures stay mild to warm throughout the year.
Red Flame-Acanthus is a fast-growing evergreen shrub that can reach about 2 to 4 meters in height, with a spread of around 1.5 to 3 meters. It develops multiple upright stems rather than a single trunk.
The stems are green when young and gradually become woody and slightly brown with age. Its root system is moderately spreading but not invasive, making it suitable for garden beds and large containers.
The leaves are large, soft, and slightly glossy, measuring around 15 to 30 centimeters long and 5 to 10 centimeters wide. They are oval to lance-shaped with smooth edges and a pointed tip. The foliage gives the plant a lush, tropical appearance and forms a dense backdrop for its flowers.
The flowers are the most enchanting, borne on tall flower spikes, which can grow 20 to 40 centimeters long. The flowers are tubular and bright orange to red, arranged in upright clusters that resemble flames, which is how the plant gets its common name.
Each individual flower is about 4 to 6 centimeters long. Flowering usually occurs in the cooler months, adding vibrant color when many other plants are resting.
After pollination, the flowers produce small capsules that are 2-3 cm long, containing multiple seeds inside. The flowers and the capsules are equally fascinating.
Gardening Tips
Red Flame-Acanthus grows best in partial shade to filtered sunlight. While it can tolerate some direct morning sun, strong afternoon sun may scorch the leaves, especially in hotter regions. In cooler climates, it can handle more sunlight as long as the soil remains moist.
The plant prefers rich, well-draining soil that is high in organic matter. Keep the soil consistently moist but not waterlogged. Regular watering is important during dry periods, particularly for young plants. A layer of mulch around the base helps retain moisture and keep the roots cool.
Prune lightly after flowering to maintain the shape of the plant and also encourage bushier growth, since the tall flower stalks can become lanky and lifeless after the capsules fall off.
Removing older stems every few years helps rejuvenate the plant. Feeding with a balanced fertilizer like compost, cow dung, or bone meal during the growing season to support strong leaf and flower production.
Uses of Red Flame-Acanthus
Red Flame-Acanthus is mainly grown as an ornamental shrub due to its dramatic flower spikes and lush foliage. It works beautifully as a focal point in tropical-style gardens or as a background shrub in mixed borders. Its bold flowers attract bees, butterflies, and other pollinators.
In traditional medicine, parts of the plant have been used in its native regions. Leaves and roots are sometimes prepared in local remedies for treating fever, respiratory issues, and inflammation. As with all medicinal plants, any internal use should be approached with proper knowledge and caution.
The plant also has cultural importance in some areas where it is used in local herbal practices and occasionally planted near homes for its striking appearance. Its dense growth can provide light screening or serve as a soft hedge in suitable climates.
Propagation
Propagation is through seeds, stem cuttings, and division of established clumps.
Seeds can be sown in warm, moist conditions, while semi-hardwood cuttings taken during the growing season root well in a humid environment with light shade.
Photographed at: The University of Trans-Disciplinary Health Sciences and Technology(TDU), Bangalore
