Roselle Hibiscus — กระเจี๊ยบชบา (kra-jip-cha-ba) — Hibiscus sabdariffa
Hibiscus sabdariffa, commonly known as roselle, roselle hibiscus, or กระเจี๊ยบชบา (Krajeab Chaba) in Thai, is a plant species native to West Africa. It is widely cultivated for its calyces, which are used to make herbal teas, jams (Recipe for Rosella jam that incorporates Thai Kumquat (Som Jeed) and ginger), jellies, and various other culinary and medicinal products. The calyces are deep red and have a tart flavor, making them popular for their use in beverages, especially as a base for hibiscus tea. Apart from its culinary uses, Hibiscus sabdariffa is also known for its potential health benefits, such as its high content of antioxidants and vitamins.
In various cultures, especially in parts of Africa, Asia, and the Caribbean, roselle hibiscus has been used for its medicinal properties. It has been traditionally believed to have diuretic, choleretic, and hypotensive properties. Additionally, it is known to be rich in vitamin C, minerals, and antioxidants, which contribute to its potential health benefits.
Due to its versatility and health benefits, Hibiscus sabdariffa has gained popularity not only in its native regions but also worldwide. As a result, it is now commonly cultivated in various tropical and subtropical regions across the globe.
Gardening Tips
Flowering and “fruit” season:
In Hua Hin’s tropical climate, roselle hibiscus typically flowers in the late rainy season to early dry season, around October to December. The edible calyxes (often called “fruits”) are usually ready for harvest about 2–3 weeks after the flowers bloom.
Propagation:
1. Seeds: The easiest method. Sow seeds directly in the garden or start them in pots.
2. Cuttings: Take 15–20 cm stem cuttings during the rainy season for best results.
3. Layering: Bend a low branch to the ground, cover part with soil, and it will root.
Pruning:
1. Prune young plants to encourage bushiness.
2. After harvesting calyxes, cut plants back.
- Light pruning: After harvesting, you can trim back the branches by about 1/3 of their length to encourage new growth and maintain shape. This is less stressful for the plant.
- Moderate pruning: If you want to control the size more significantly, you could cut back to about half the original height.
- Heavy pruning: In some cases, cutting back to 60–90 cm (2–3 feet) from the ground can rejuvenate very old or overgrown plants. However, this is more stressful and should only be done if necessary.
3. In Hua Hin’s climate, roselle can be grown as a perennial. Prune heavily at the end of the dry season to rejuvenate plants.
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