How to grow Mustard Greens in the UK
Brassica juncea
Mustard Greens (Brassica juncea) is a vegetable that grows well in UK gardens. Hot, peppery alternative to rocket. Autumn-sown crops sweetest. 'Red Frills' looks great in salads. This guide covers when and how to sow Mustard Greens, the soil and position it likes, watering and feeding, companion planting, and when to harvest.
When to sow & grow Mustard Greens
Sowing and harvest window through the year (UK):
Jan | Feb | Mar Sow | Apr | May Harvest | Jun Harvest | Jul Harvest | Aug Sow · Harvest | Sep Harvest | Oct Harvest | Nov Harvest | Dec |
Soil, position & care
- Soil
- Fertile, free-draining soil enriched with garden compost
- Soil pH
- 6.5–7.0 (neutral)
- Position
- Open, sunny site
- Sowing depth
- 1 cm
- Spacing
- Thin to 20 cm
- Sowing
- Sow Mar–Sep; hotter in summer, milder in cool weather
- Growing
- Keep weed-free and evenly watered; mulch to hold moisture
- Harvest & upkeep
- Cut young leaves for salads or larger for stir-fry
- Watch for
- Flea beetle, slugs
Companion planting for Mustard Greens
Grows well with:
Keep apart from:
Add Mustard Greens to your free 12-month plan and get watering & sowing reminders — no sign-up needed.
Mustard Greens FAQs
When should I sow Mustard Greens in the UK?
In the UK, sow Mustard Greens in March, August. Sowing across these months gives the plant the right soil temperature and day length to establish well.
What grows well with Mustard Greens?
Mustard Greens grows well alongside Beetroot, Celery, Dill, French Marigold, Pot Marigold, Mint. Good companions can deter pests, attract pollinators or make better use of space.
What should you not plant near Mustard Greens?
Keep Mustard Greens away from Strawberry, Beef Tomato, Cherry Tomato, which can compete with it or share pests and diseases.
How much sun does Mustard Greens need?
Mustard Greens prefers partial sun (3–6 hrs).
When is Mustard Greens ready to harvest?
Mustard Greens is typically ready to harvest in May, June, July, August, September, October, November in the UK.
Is Mustard Greens easy to grow?
Easy — good for beginners. Hot, peppery alternative to rocket. Autumn-sown crops sweetest. 'Red Frills' looks great in salads.