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Leek: when to sow, plant out and harvest

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 under coverSow outdoorsPlant outHarvest
Northern France4 February – 24 February1 March – 31 May25 March – 14 April1 July – 30 April
Atlantic coast25 January – 14 February19 February – 21 May15 March – 4 April21 June – 20 April
Eastern France27 January – 16 February21 February – 23 May17 March – 6 April23 June – 22 April
Mediterranean24 December – 13 January18 January – 19 April11 February – 3 March20 May – 19 March
Mountains (around 1,000 m)1 March – 21 March26 March – 25 June19 April – 9 May26 July – 25 May

Growing

Family
Amaryllidaceae
Latin name
Allium porrum (A. ampeloprasum Porrum group)
Cold tolerance
Hardy (withstands frost)
Soil temperature to germinate
10 °C minimum
Emergence
7–12 days
Between rows
30–40 cm
In the row
10–15 cm
To harvest
120 days

Companion planting

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

Good neighbours

Keep apart

Sources