Welsh onion: when to sow, plant out and harvest

Also called: Bunching onion.

Sowing, planting and harvest dates for your climate, good and bad companions, growing tips.

When to sow in your region

Average dates, computed from the frost dates of each climate. For your exact dates, choose your town.

ClimateSow outdoorsHarvest
Northern France1 March – 30 April; 1 August – 31 August1 June – 31 October
Atlantic coast19 February – 20 April; 5 August – 4 September22 May – 4 November
Eastern France21 February – 22 April; 30 July – 29 August24 May – 29 October
Mediterranean18 January – 19 March; 21 August – 20 September20 April – 20 November
Mountains (around 1,000 m)26 March – 25 May; 30 June – 30 July26 June – 29 September

Growing

Family
Amaryllidaceae
Latin name
Allium fistulosum
Between rows
20 cm
In the row
10 cm
To harvest
90 days

Companion planting

The level of evidence is shown for each pairing: many rest on tradition rather than on studies.

Good neighbours

No documented pairing.

Keep apart

No documented pairing.

Sources