vegetable
brassica family

Mustard Greens

Brassica juncea

Mustard greens deliver punchy, peppery leaves all year round given a little protection. Varieties like 'Red Giant', 'Green in Snow' and 'Golden Streaks' add colour and bite to winter salads and stir-fries. Sow little and often from March to September, direct or in modules — they germinate fast and can be cut as baby leaves in just three weeks. The best crops come from late summer sowings (August–September) which mature in cool weather and stand right through winter under a cloche or in a polytunnel. Hot summer sowings bolt quickly and turn unbearably hot, so favour spring and autumn. A brilliant catch crop between slower brassicas, and a useful green manure when dug in young.

Plan where to grow Mustard Greens using our vegetable garden planner.

SunlightPartial shade
WateringModerate
Height40cm
Spacing20cm
Germination4–7 days
Sowing MethodDirect or under cover
Frost HardinessHardy
Sowing Depth1cm

When to Sow Mustard Greens

Sow mustard greens in March, April, May, June, July, August, September.

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sowing months

Time to Harvest Mustard Greens

Expect to harvest approximately 2 months after sowing.

Companion Plants

Expected Yield

Cut-and-come-again over 6–8 weeks per sowing.

Common Problems with Mustard Greens

Bolting in summer

Hot dry weather and long days trigger flowering. Stick to early spring and late summer sowings, and provide afternoon shade in June and July.

Flea beetle holes in leaves

Tiny pinholes are flea beetle damage. Cover with fine mesh from sowing, water well to keep plants growing fast, and sow after the worst of the spring outbreak (late July onwards).

Leaves taste unbearably hot

Heat intensifies the mustard flavour. Pick young (10–15cm), water generously and grow in cooler shoulder seasons for milder leaves.

Plan your mustard greens in the allotment planner

Drag and drop plants onto your plot and get personalised sowing reminders.

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