If you’ve ever been to the beach, especially the sunny and windy beaches along the central coast of Vietnam, you might have spotted the coastal milkweed. This unique tree, known locally as “cây bàng biển,” thrives in coastal areas and bears grayish-white flowers with pink spots. Let’s dive deeper into the characteristics and benefits of this fascinating tree!
1 What is the Coastal Milkweed?
Origin and Significance of the Coastal Milkweed
The coastal milkweed, scientifically known as Calotropis gigantea (L.), is a tree species commonly found in coastal regions. It belongs to the Apocynaceae family and the Calotropis genus.
This tree thrives in tropical climates and is native to several countries with such climates, including Cambodia, Indonesia, Thailand, India, China, and Sri Lanka.
In Vietnam, the coastal milkweed is prevalent along the coasts of central and south-central provinces, which experience hot and sunny weather.
Introduction to the Coastal Milkweed
Characteristics and Classification of the Coastal Milkweed
The coastal milkweed boasts a broad, straight, and beautiful canopy. It typically grows to a height of 7-10 meters, although some specimens can reach up to 20 meters tall. Its bark is grayish-brown, and its branches grow horizontally, forming distinct layers along the trunk.
The leaves are large, turning red when dry, with short petioles. They are oblong, measuring 15-36 cm in length and 8-24 cm in width. The leaves are dark green on the upper surface and light green on the underside, with a glossy appearance. Interestingly, the leaves can change color, displaying hues ranging from crimson to purple and even yellow during the winter months.
Flowers of the Coastal Milkweed
The flowers of the coastal milkweed are grayish-white with pink spots and a delicate coating of hair on the outer surface. They measure approximately 1.5-2.5 cm across and emit a subtle fragrance. Occasionally, the flowers may exhibit a mauve shade with a deeper purple tint on the upper surface. The tree blooms almost year-round.
The fruits are smooth and glossy, transitioning from green to yellow or red as they ripen. Within each fruit lies a hard seed with a pleasant taste, which can be used to produce oil.
2 Benefits of the Coastal Milkweed
In traditional medicine, the coastal milkweed is valued for its cooling properties and bitter taste. It is believed to possess detoxifying and anti-tussive effects and is often included in remedies for chronic bronchitis and persistent coughs. Additionally, the tree is said to be beneficial for treating skin ailments, syphilis, diarrhea, and joint pain.
However, it is important to note that the coastal milkweed contains toxins, and improper use can be harmful. Always seek guidance from a qualified healthcare professional before using this plant for medicinal purposes.
Benefits of the Coastal Milkweed
3 Growing and Caring for the Coastal Milkweed
How to Grow the Coastal Milkweed at Home
Propagation can be achieved through cutting a semi-hardwood branch and ring-barking it. Then, cover the ringed area with a soil mound and wait for roots to develop before cutting the branch and planting it in a seedling pot.
Continue watering the seedling, and once it reaches a height of approximately 30 cm, transplant it into sandy soil outdoors. Prior to planting, dig a hole a week in advance, then tear the seedling bag and place it in the hole, filling it with soil and supporting it with a stake to prevent toppling.
Caring for the Coastal Milkweed
- Watering: This tree can thrive with minimal water, so maintain a watering schedule of 2-3 times per week, or once a week for larger trees.
- Light: The coastal milkweed thrives in sunny conditions, so ensure it receives ample sunlight by planting it in an open, well-lit area.
- Fertilizer: Supplement the tree with NPK fertilizer once every three months.
- Pests and Diseases: Keep an eye out for leaf-sucking insects like mealybugs, as the leaves are susceptible to their attacks.
Benefits of the Coastal Milkweed
Notes on Growing and Caring for the Coastal Milkweed
- Prune away any yellowing or withering leaves and branches.
- In case of severe pest infestation, purchase and apply appropriate pesticides.
- When fertilizing, avoid applying fertilizer directly to the root zone, and water immediately afterward to prevent fertilizer burn.
4 6 Captivating Images of the Coastal Milkweed
Beautiful Purple Flowers
Coastal Milkweed in Bloom
Flowers of the Coastal Milkweed
The Coastal Milkweed’s Health Benefits
We hope you found this information about the coastal milkweed interesting and useful!
