Jun, Jul, Aug
At its best:
Sow seed in moist compost in small pots or cells. You can also sow direct in the ground, but seedlings can be devoured by slugs. Thin out young seedlings to two per pot and keep them well watered.
When seedlings are 5cm tall, plant them out into a moisture-retentive soil, firming in well. Water the newly transplanted plants and keep them well watered to prevent bolting. Cover the crop with horticultural fleece to provide a barrier to airborne pests, such as flea beetles.
You can harvest the young leaves after 30 days, to add to salads. From 45 days, the plants should have developed a 'heart' and be ready to harvest for stir fries. Pak choi is most succulent and has the best flavour when eaten fresh from the plot, so only harvest what you need, when you need it.