If you grew up in Asia – or have had some exposure to its food – you’ve most definitely encountered the Chinese water spinach, sometimes called morning glory. A long, crunchy vegetable with a hollow stem, it’s usually served as a side dish, draped with a blanket of minced garlic, water, a pinch of salt and a touch of umami (usually from MSG). In Southeast Asia, where the vegetable is most prevalent, the simple garlic and water slurry is elevated with chilli, shrimp paste and fermented bean sauce. Despite its name, Chinese water spinach is not actually a spinach. It’s not even in the same plant family, and the misnomer might be the fault of grocers, who tend to assign the word to anything miscellaneously leafy and green. The Chinese water spinach, or Ipomoea aquatica , is part of the morning glory genus, named for their trumpet-shaped flowers that peak at full bloom in the morning. But when it comes to the Chinese water spinach, the stem is the main attraction. The stalks are thick, hollow, crunchy things that are great at absorbing flavour. As a kid, I would spend evenings with my mother knelt over a colander full of water spinach, picking out the most tender stems. Chinese food ‘undervalued’ in US, says chef selling US$30 fish noodle soup Water spinach is known by the Chinese name kongxincai , which literally means “empty heart vegetable.” The poetic moniker comes from a 16th-century fable about a government minister who is forced to gouge out his heart after one of the king’s wives tires of his advice. His tomb notably had just a single plant growing: the kongxincai , or empty heart vegetable. Historical records going back to the Ming dynasty (1368-1644) say the vegetable came to China by way of tropical Southeast Asia, where it’s known as kangkong, or swamp cabbage, because it can grow both on land and in water. Some farmers plant it directly in wet soil; others choose to let the hollow stems float on top of nutrient-rich ponds. The vegetable is also known as ong choy in Cantonese, a name that comes from this method of raising the plants. Ong refers to the simple propagation technique: taking a cutting and packing the bottom of the stem in moist soil. European records of the Chinese water spinach date back as early as the 16th century, and in particular, they note the plant’s extreme productivity. American Chinese chain Panda Express and its ‘authentic’ Chinese food Under optimal conditions, it can produce up to 76 tonnes of food per acre in nine months, growing at a rate of 10cm per day. That’s great if you need a lot of food, less so if you’re trying to keep your land clear. In 1973, the state of Florida banned the cultivation of Chinese water spinach, which had been brought in as a non-native food crop, because it began spreading across ponds, clogging waterways and obstructing boats. Federal regulators then classified it as a noxious weed, and to this day, some states still prohibit the sale of Chinese water spinach, while others have allowed farmers to grow them only with permits. In 2003, 90 per cent of commercial water spinach in the United States was grown in northern California, according to a Portland State University report. In Asia, the water spinach is far from demonised, and in Asian supermarkets across the US, it remains an irreplaceable grocery item. Some communities where it’s banned are even willing to smuggle them in. Because a weed, after all, is in the eye of the beholder, and the Chinese water spinach has been overlooked for its most redeeming quality: a food source that grows indefinitely in wet environments, and a tasty perennial that keeps on giving. This article was originally published on Goldthread . Follow Goldthread on Facebook , YouTube and Instagram for more stories about Chinese culture.