Pak Choi is one of the more tricky oriental leaves to grow. It's best sown from late July onwards to avoid the summer heat that can make it bolt, and the nibblings of flea beetles that can pepper the leaves with holes.
Time from seed to plate: 8 weeks
Sow pak choi seeds directly into your plot during July or August. Make a drill about 1/2 an inch deep and sprinkle in seeds leaving 1-2 inches between them. Firm back the soil and water. Leave 12in between drills if you're sowing more than one.
If we're short of space, or want to get the plants off to a quick start we sow our seeds in gutters filled with compost. Thin them to leave 3 inches between plants, then about four weeks after sowing plant them out individually in your plot, leaving 6 inches between plants and 12 inches between rows. Have a look at the video.
Thin your seedlings to leave one plant every 6in or so. Keep well watered, especially in the summer.
Keep an eye out for caterpillars and pick them off by hand.
Harvest 6-8 weeks from sowing. Either pick the whole plant, or pull off individual leaves as you need them, leaving the plant to carry on growing.