Last edited by shiny on November 04, 2026. View history
Welsh Bunching Onion
Welsh Bunching Onion
A variety of Welsh onion
How to sow Welsh bunching onion: Division or direct seed
Sun requirement for Welsh bunching onion: Plant in Full Sun
A perennial bunching onion that keeps growing and multiplying, like a large spring onion, with an outstanding flavour. The whole stem, green and white, is chopped into cooking or eaten raw in salads, and it can be harvested all year by cutting at the base. Scatter-sow in trays in early spring, then plant out with roots and tops trimmed to 10 cm, spaced 10 cm apart. After a year, divide the clumps and replant at 30 cm spacing, and divide them yearly to keep them at their best.
- 0
- plantings
- 0
- harvests
- 1
- seed packet
Welsh bunching onion facts
Lifespan
Row Spacing
10cm median of members' seed packetsWhen to sow
Crop cycle
Max altitude
Optimal light
What are growing degree days?
A plant grows with warmth, not with days. A growing degree day is one day's worth of useful warmth: how many degrees the day's average temperature is above the lowest temperature the crop grows at. Add them up from planting and you know how far along the crop is, whatever the calendar says.
Say that lowest temperature is 10°C. A day averaging 17°C gives 7 growing degree days. A day averaging 8°C gives none, as it is too cold for the crop to grow. That is why the same lettuce takes about 50 days in a summer and 90 in an autumn: it needs the same total warmth either way.
For Welsh bunching onion, the FAO EcoCrop database gives a lowest growing temperature of 6°C and a shortest growing cycle of 60 days at its best temperature, about 750 growing degree days to a first harvest.
Where you've told us where your garden is, we use this and the weather there to predict when your Welsh bunching onion will be ready to harvest. We don't use it for how long a plant lives or when it finishes: we go by what members have logged for that.
Video
What people are saying about Welsh bunching onions
Nobody has posted about Welsh bunching onions yet.
Sign in or sign up to post your tips and experiences growing Welsh bunching onions.
Who's planted Welsh bunching onions
Nobody has planted this crop yet.
Sign in or sign up to track your Welsh bunching onion plantings.Welsh bunching onion harvests
Nobody has harvested this crop yet.
Sign in or sign up to track your Welsh bunching onion harvests.Find Welsh bunching onion seeds
View all Welsh bunching onion seeds
- Purchase seeds via Ebay
- Sign in or sign up to list your seeds to trade.
Time to harvest
If sown now, expect a first harvest in about 60 to 160 days.
From the growing cycle in the FAO EcoCrop database, which is the same wherever it is grown.
Ecological requirements
Data from the FAO EcoCrop database for Allium fistulosum L.
| Family / Taxonomy | Liliopsida Liliidae Asparagales Alliaceae |
|---|---|
| Life form | herb |
| Life span | annual, perennial |
| Habit | erect |
| Optimal soil depth | medium (50-150 cm) |
| Optimal soil texture | medium, organic |
| Optimal soil fertility | high |
| Optimal soil drainage | well (dry spells) |
| Optimal soil salinity | low (<4 dS/m) |
| Photoperiod | short day (<12 hours), neutral day (12-14 hours), long day (>14 hours) |
Learn more about Welsh bunching onions
Resources outside Growstuff.
