Mizuna and mibuna are tolerant of cool, wet conditions and dislike extreme heat. Grow in an open, sunny position, with some shade in summer. If subjected to dry conditions, growth may appear stunted and plants will bolt prematurely. Soil should be moist – improve with well-rotted organic matter before sowing and planting, if necessary.
Mizuna has feathery leaves up to 25cm (10in) high; the rosettes (heads) of mizuna can grow to 23cm (9in) high and can spread to 45cm (18in).
Mibuna grows to about 30cm (1ft) high, producing tight clusters of long, narrow leaves. It is very easy to grow and can be cut four or five times; the new growth is more resistant to frost and cold.
Water well, before the onset of drought. There is a risk of bolting in very hot dry conditions - less so with early sowings - but also if sown too early when conditions are too cold.
Slugs: Eat leaves and young shoots.
Remedy: Non-chemical controls including hunting by torchlight on mild, damp nights, or making traps consisting of a jar half-filled with beer sunk into the ground near plants. Encourage natural predators, use pellets based on ferric phosphate.
Read more information on slugs
Bolting: Plants flower and set seed, rather than producing edible roots. This is usually caused by stress, a hot or cold spell or drought. It is less of a problem with early sowings.
Remedy: Sow bolting resistant varieties, warm the soil before sowing early crops and grow under the protection of fleece or cloches and keep the soil moist.
Flea beetle: Leaves are peppered with small holes, damaged areas turn brown. Seedlings are particularly susceptible
Remedy: Grow plants under horticultural fleece, keep the soil moist.
Read more information on flea beetle
‘Cut and come again’ seedlings can be harvested from around three weeks after sowing; larger plants can be harvested up to five times before ‘bolting’.
Harvest heads using a sharp knife, from six to eight weeks. Individual leaves can be cut regularly from plants for a constant supply. Remove a few leaves from several plants, to avoid weakening individual plants.
Harvest and eat immediately for the best flavour.
‘Mizuna’: Long green deeply cut leaves with white stems.
‘Mizuna Purple’: Purple-tinted stems, the colour becoming stronger as they mature.
‘Kyoto’: Well-flavoured and very hardy for sowing all year round - better under cover in winter.