The hibiscus used for tea is Hibiscus sabdariffa, commonly called roselle. It’s a woody shrub related to okra in the mallow family, and it grows in tropical and subtropical regions worldwide. While there are hundreds of hibiscus species, roselle is the one behind virtually every “hibiscus tea” you’ll find on store shelves or in tea blends.
How Roselle Differs From Ornamental Hibiscus
The large, showy hibiscus flowers you see in landscaping are typically Hibiscus rosa-sinensis, the tropical ornamental variety. These aren’t used for tea. Roselle looks quite different: it has bright red stems, green leaves with red veins, and relatively modest yellow-white flowers about 3 to 6 inches across. As the plant matures, its leaves shift from simple single-lobed shapes to deeply divided leaves with three to five lobes.
What makes roselle visually distinctive in a garden is the color. The stems are a deep red-burgundy, and the veining in the leaves carries that same reddish tint. It grows as an annual in most climates but can persist as a perennial in the tropics.
The Part That Actually Becomes Tea
Here’s something that surprises most people: hibiscus tea isn’t made from the petals. It’s made from the calyx, the fleshy, deep-red structure that surrounds the base of the flower and encloses the developing seed pod. The calyx swells after the flower fades, turning plump and bright crimson. These calyces have a tart, cranberry-like flavor and produce that signature ruby-red color when steeped in hot water.
The calyces are rich in antioxidant compounds called anthocyanins, which are responsible for both the vivid color and much of the health interest in hibiscus tea. They also contain calcium and small amounts of vitamin C, protein, and carbohydrates. The tartness comes from naturally occurring organic acids, giving the tea a flavor profile closer to cranberry juice than to floral teas like chamomile.
A Drink With Dozens of Names
Roselle tea is one of the most widely consumed herbal beverages on the planet, and nearly every region has its own name for it. In Mexico and Central America, it’s agua de Jamaica. In Egypt and Sudan, it’s karkadé. Across West Africa, you’ll hear it called bissap in Senegal (where it’s considered the national drink), zobo in Nigeria, and sobolo in Ghana. In the English-speaking Caribbean, it’s simply called sorrel and is a staple of Christmas celebrations.
The preparation varies by region too. In Thailand, it’s typically served ice-cold and heavily sweetened, sold in plastic bags at street markets. In Egypt, karkadé is enjoyed both hot and chilled. In the Caribbean, sorrel drinks are often spiced with ginger, cloves, and cinnamon. The plant likely originated in Sudan, but it’s now cultivated across the tropics from Southeast Asia to Latin America.
What About Other Edible Hibiscus Species?
Roselle isn’t the only edible hibiscus, but it’s the primary one used for tea. Cranberry hibiscus (Hibiscus acetosella) has deep burgundy leaves that can be brewed into a tea or eaten raw in salads, though it’s far less common for this purpose. A third edible species, sometimes called edible leaf hibiscus, produces large tender leaves used more like spinach in cooking than for beverages.
If a product is labeled “hibiscus tea” without further specification, it’s made from Hibiscus sabdariffa calyces.
Blood Pressure and Other Health Effects
The most studied health benefit of hibiscus tea is its effect on blood pressure. A USDA-funded clinical trial found that participants who drank hibiscus tea daily experienced a 7.2-point drop in systolic blood pressure, compared to just 1.3 points in the placebo group. Among those who started with elevated readings of 129 or above, the results were more dramatic: systolic pressure dropped by 13.2 points and diastolic by 6.4 points.
Some evidence suggests that two to three cups per day may support these blood pressure benefits, though long-term studies on daily consumption in the general population are limited. Because hibiscus can lower blood pressure, it may amplify the effects of blood pressure medications. People who are pregnant are generally advised to avoid it, as safety data during pregnancy is lacking.
Growing and Harvesting Your Own
If you live in a warm climate (or have a long growing season), you can grow roselle and harvest your own calyces for tea. The plant needs heat and does best where summers are long. After the small flowers bloom, you wait two to three days until the petals look dry and spent. A good test: if you can gently pull the faded flower and it comes out cleanly, the calyx is ready. If the flower tears when you pull, give it another day.
Once the flower is removed, snap off the calyx from the stem. Fresh calyces can be frozen for later use or dried for shelf-stable storage. Some growers let the calyces dry right on the stems in the sun, while others harvest them fresh and dry them indoors. Dried calyces keep well in a sealed jar and can be steeped in boiling water whenever you want a cup. The leaves of the plant are edible too, used in some cultures as a cooked green similar to a tangy spinach.