Bok choy

Bok choy is closely identified with Chinese agriculture and cuisine, but calling it simply “native to China” leaves out an important distinction. It is a domesticated leafy crop, not a wild plant with a sharply defined natural range. Farmers in China shaped it from Brassica rapa, selecting plants for broad green leaves, compact growth, and succulent pale or green stalks.

Brassica rapa has a complicated history. Its many cultivated forms include turnips, napa cabbage, mizuna, tatsoi, and oilseed crops, and research suggests that domestication and diversification occurred across more than one part of Eurasia. Bok choy itself, however, is understood as a Chinese vegetable group with a long history of cultivation, especially in southern and central Chinese food traditions.

Its name reflects Cantonese usage: “bok choy” is commonly interpreted as “white vegetable,” referring to the pale-stemmed forms familiar in many markets. The crop also appears under names such as pak choi and Chinese cabbage, although the latter can cause confusion with napa cabbage, a related but distinct Brassica rapa vegetable.

Chinese migration and expanding international trade carried bok choy throughout East and Southeast Asia and later to Europe, Australia, and the Americas. Today it is grown both in major Chinese production areas and in temperate market-garden regions worldwide. California is an important United States producer, supplying mature heads and small “baby” bok choy to supermarkets, restaurants, and Asian produce markets.