Komatsuna (Brassica rapa var. pervidis or var. komatsuna) is a type of leaf vegetable. It is a variant of the same species as the common turnip. It is grown in Japan, Taiwan and Korea. It is also known as Japanese Mustard Spinach and can be stir-fried, pickled, boiled and added to soups or used fresh in salads. It is an excellent source of calcium. It is also used for fodder in some Asian countries. The leaves of komatsuna can be eaten at any stage of growth. In a mature plant they are are dark green with slender light green stalks, around 30 cm long and 18 cm wide. It is most often grown in the spring and autumn, as it cannot endure extreme heat or cold for more than a short time.
-  "Komatsuna: Commercial Production." Queensland Government, Department of Primary Industries and Fisheries.