Sow pak choi
(also known as bok choy) in well-composted soil in a sunny position. If picking baby leaves, thin seedlings 10cm apart. For semi-mature plants, thin to 20cm, for mature plants thin to 30cm. Keep plants well watered to prevent early bolting and bitter flavour. To combat whitefly, regularly blast leaves with a strong jet of water, or cover with insect-proof netting.