Japanese mustard spinach (Komatsuna) 
Japanese mustard spinach or Komatsuna is a Japanese vegetable whose young leaves, stalks and flower shoots are used in salads and stir-fries.
Plants generally grow quite tall with large, dark green leaves.
Sowing
Sow seeds thinly, about 2.5-5cm (1-2in) apart from April to August. After a couple of weeks thin out to 20-45cm (8-15in) apart. The thinnings can be eaten.
Growing
Keep the soil consistently moist; water well during dry and hot periods.
Feed occasionally with a liquid fertiliser.
Harvesting
Harvesting can start from around 30 days after sowing. At any time from when the plants are 10cm (4in) high, cut them about 2.5cm (1in) above ground level so that plants can re-shoot to produce further crops.
Up to three cuttings per plant can be harvested over several months. Or you can cut leaves as and when you need them.
