Sea coconut is a term used for two very different tropical fruits. In Asian grocery stores and dessert shops, “sea coconut” almost always refers to the translucent, jelly-like flesh of the palmyra palm fruit (Borassus flabellifer), sold canned or fresh and prized for its cooling properties. But the original sea coconut is the coco de mer (Lodoicea maldivica), a massive palm from the Seychelles Islands that produces the largest seed of any plant on Earth, weighing up to 55 pounds.
Which one you’re looking at depends entirely on context. If you’re browsing a recipe or an Asian supermarket aisle, it’s the palmyra palm. If you’re reading about botanical records or rare plants, it’s the coco de mer. Here’s what to know about both.
The Two Plants Called Sea Coconut
The palmyra palm is a tall, fan-leaved tree common across South and Southeast Asia. Its young fruit contains a soft, gelatinous endosperm that’s nearly flavorless on its own, with a texture somewhere between lychee and coconut jelly. This is what gets labeled “sea coconut” in canned goods and dessert menus throughout China, Thailand, Vietnam, and Malaysia. You’ll find it packed in syrup at most Asian grocery stores.
The coco de mer, by contrast, is one of the rarest palms in the world. It grows wild on only two small islands in the Seychelles: Praslin and Curieuse. Its seeds can measure up to half a meter long and weigh 25 kilograms (about 55 pounds). The name “sea coconut” likely originated because the enormous seeds occasionally washed ashore on distant coastlines, long before anyone knew where they came from. Sailors who found them floating in the Indian Ocean assumed they grew from a tree beneath the sea.
The Coco De Mer: World’s Largest Seed
Mature coco de mer palms can reach over 100 feet tall, with fan-shaped fronds stretching up to 30 feet long and 15 feet wide. The fruit takes about seven years to fully ripen on the tree, and each one contains a distinctive two-lobed seed that gives the plant its other common name: double coconut. The suggestive shape of the seed has made it a collector’s item for centuries.
Scientists believe the seeds evolved to be so enormous because the Seychelles lacked large animals that could carry seeds to new locations. Without a need for portability, the seeds simply kept getting bigger over millions of years of stable island conditions. Today, only around 8,000 wild mature coco de mer palms remain, largely due to overharvesting and poaching. The seeds are highly valuable, attracting both tourists and illegal collectors.
Sea Coconut in Asian Cooking
When recipes call for sea coconut, they mean the palmyra palm variety. The canned version is the most widely available outside Southeast Asia. The fruit pieces are pale, slightly chewy, and absorb whatever flavors surround them, making them ideal for sweet soups and chilled desserts.
The most common preparation is a simple chilled dessert soup. Sea coconut pieces are simmered with rock sugar and other ingredients like dried longan, red dates, snow fungus, or goji berries, then served cold. The combination is considered a cooling food in Chinese dietary tradition, often prepared during hot weather or when someone has a cough or sore throat. In traditional Chinese food therapy, ingredients like these are grouped by their warming or cooling properties, and sea coconut falls firmly on the cooling side.
Fresh palmyra palm fruit is seasonal and harder to find outside tropical regions. The young fruit is sliced open to reveal translucent, watery pods that can be eaten raw. The texture is softer and more delicate than the canned version, almost like a firm jelly. Street vendors across Southeast Asia sell them chilled as a snack.
Nutritional Value
Nutritional data specific to palmyra palm sea coconut is limited in Western databases, but the fruit is low in calories and high in water content. It provides small amounts of potassium, calcium, and iron. The appeal is more about hydration and texture than dense nutrition.
In traditional Chinese food therapy, sea coconut is valued for its ability to support respiratory comfort and soothe the throat. These properties haven’t been studied extensively in clinical trials, but the tradition of using sea coconut in medicinal soups goes back generations across southern China and Southeast Asia. You’ll often see it sold alongside dried herbs marketed for lung and throat health.
How to Buy and Store Sea Coconut
Canned sea coconut is the easiest option for most people. Look for it in the canned fruit or dried goods section of any well-stocked Asian grocery store. The pieces are typically packed in sugar water and ready to use. Once opened, transfer them to a sealed container and refrigerate. They’ll keep for about a week.
Dried sea coconut is also common, sold in bags alongside other soup ingredients like dried figs and apricot kernels. These need to be soaked before cooking, usually for 30 minutes to an hour, and they rehydrate into a firmer, chewier texture than the canned version. Dried sea coconut stores well in a cool, dry place for several months.
If you encounter fresh palmyra fruit at a market, choose ones that feel heavy for their size, with no cracks in the outer husk. The flesh inside should be translucent and firm. Eat it within a day or two, as it deteriorates quickly once exposed to air.