Clerodendrum minahassae, often recognized by its common names “Tube Flower,” “Fountain Clerodendrum,” or “Starfish Glory Bower,” is a captivating tropical plant. This species originates from Southeast Asia, with its natural range spanning regions like Sulawesi, Indonesia, Singapore, Malaysia, and the Philippines. Its striking and distinctive blooms make it a popular choice for ornamental gardens, attracting a variety of pollinators.
Understanding Clerodendrum Minahassae
Clerodendrum minahassae is a large shrub or small tree, reaching heights of up to 4.6 meters. It often develops a multi-stemmed, V-shaped habit, creating a wide-spreading crown. The foliage consists of dark green, glossy, elongated, and elliptical leaves, sometimes with a wrinkled texture.
Its most notable feature is fragrant, long, tubular flowers, white or pale pink. These blooms are arranged in clusters near the stem tips, emerging from spring through summer. After the flowers fade, the green calyces swell and turn a fleshy red, unfurling into a star shape. These red calyces then frame small, round, blue-black berries, creating contrast that persists for several months.
Cultivating Clerodendrum Minahassae
Light
It thrives in bright conditions, preferring full sun to mostly sunny locations for good flowering and growth. While it can tolerate partial shade, this may result in fewer blooms. Providing morning sun is beneficial, as it offers intense light without the harshest heat of the afternoon.
Soil
Clerodendrum minahassae performs best in well-draining soil rich in organic matter. It prefers a slightly acidic to neutral pH, between 6.0 and 7.5. Ensuring good drainage is essential to prevent waterlogging and root damage.
Water
Consistent moisture is essential for this tropical plant, especially during growing and flowering. Regular watering keeps the soil evenly moist but not saturated. Once established, the plant exhibits moderate drought tolerance, but prolonged dry periods should be avoided.
Temperature and Humidity
As a tropical plant, Clerodendrum minahassae flourishes in warm, humid environments. It is resistant to heat and humidity, suitable for tropical and subtropical climates. Temperatures should be between 18 to 35°C (64 to 95°F), as the plant is sensitive to freezing temperatures, causing damage.
Fertilizer
For vigorous growth and flowering, Clerodendrum minahassae benefits from regular fertilization. A balanced, all-purpose fertilizer can be applied during the growing season. Following product instructions ensures adequate nutrients without over-fertilization.
Pruning
Pruning controls size and shape, encouraging more blooms. Heavy pruning requires caution, as it can stimulate the plant to produce root suckers. Light, regular shaping is preferred to maintain its form and promote a continuous display of flowers.
Propagating Clerodendrum Minahassae
Propagating Clerodendrum minahassae is effective through stem cuttings. Semi-hardwood cuttings, taken from healthy, mature stems, root well. These cuttings should be about 4-6 inches long, with lower leaves removed and a few leaves remaining at the top.
Planting these cuttings in a well-draining rooting medium, providing warmth and consistent humidity, encourages root development. Covering the cuttings with a plastic bag or placing them in a propagation chamber maintains humidity. While seed propagation is possible, it is more challenging and less predictable than cuttings.
Addressing Common Issues
Though robust, Clerodendrum minahassae may face common garden issues. Pests such as spider mites and mealybugs may appear. Regularly inspecting the foliage, especially the undersides of leaves, helps detect infestations early. A gentle spray of insecticidal soap or neem oil manages these pests effectively.
Fungal diseases, often linked to excessive moisture or poor air circulation, are also a problem. Leaf spot or root rot occur if the plant is overwatered or planted in poorly draining soil. Proper soil drainage and allowing the soil to dry slightly between waterings mitigate these risks. Environmental stresses, such as nutrient deficiencies, can cause leaf yellowing; addressing these through appropriate fertilization restores plant health.