PlantSowGrow
How to grow Mustard Greens (Red Frills)
Brassica juncea
🥕 Vegetable
🌱 Grown each year
Feathery purple leaves with a hot, peppery kick — cut young for salads or older for stir-fries. Hardy enough to pick all winter.
At a glance: Sow late March to late April, harvest from mid April.
When to sow, plant and harvest
JanFebMarAprMayJunJulAugSepOctNovDec
Sow outdoors
Harvest
Timed for a typical UK garden (last frost mid-April). The app uses your own town's frost dates.
Growing Mustard Greens (Red Frills): what it needs
- Light
- Full sun · 6+ hours a day
- Watering
- Water regularly in dry weather
- Soil
- Fertile, well-drained soil
- Spacing
- 15 cm
- In pots
- Grows well in containers
- Feeding
- A general feed before sowing or planting
- Harvest
- About 30 days from sowing
- Hardiness
- USDA zones 3–9
- Difficulty
- Easy
Step by step
- Late March – late April · 3 weeks before the last spring frost
Sow Seeds Outdoors
Sow thinly in drills where they are to grow.
Or: Sow Outdoors (Autumn) (Mid July – mid September · 13 weeks after the last spring frost)
- 3–7 days after “Sow Seeds Outdoors” · Late March – early April
Check Germination
Seedlings should appear in 3–7 days. If sown outdoors, thin to 15 cm apart when big enough to handle.
- 23–44 days after “Check Germination” · Mid April – mid May
Start Harvesting
Snip leaves at 5–10 cm for salad; they regrow two or three times.
- 14–28 days after “Start Harvesting” · Early May – mid May
Sow Another Batch (optional)
Sow a short row every three weeks; late-summer sowings last longest.
- 60–90 days after “Sow Another Batch” · Early July – early August
Finish and Clear
Clear the remains to the compost heap once cropping ends.
