Brassica parachinensis
Family: Brassicaceae
Common Name: False Pak-choi, Chinese Tsai Shim

The whole of this plant is edible, including the yellow flowers. It may be eaten boiled, steamed or fried, and is a rich source of calcium, dietary fiber and vitamin A, also supplying a little potassium. It is an upright grower and has elliptical, mid-green leaves, with green stems and veins. Choy sum is a fast growing plant, flowering when it has seven or eight leaves. These are harvested just as the first flower buds begin to open.

Cultivation

Soil should be well drained and contain plenty of organic matter. Dig in manure or compost four to six weeks before planting. Unless soils are known to be alkaline, apply a light dressing of lime to the planting area prior to sowing the seed. Space plants about 20 cm (8 in) apart. Keep them growing actively by regular watering and keep the area free of weeds. Plants are ready for harvest about seven to eight weeks after sowing.

Climate

Best in cool conditions. Grow as a summer or autumn annual in all climates.