When to plant leeks
In zone 8, most of the UK: plant out from April to June. First harvest about 150 days later.
Growing stages
Leeks: calendar by hardiness zone
| Zone | January | February | March | April | May | June | July | August | September | October | November | December |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zone 6 | Sowing or planting | Sowing or planting | Harvest | Harvest | Harvest | Harvest | ||||||
| Zone 7 | Sowing or planting | Sowing or planting | Sowing or planting | Harvest | Harvest | Harvest | Harvest | |||||
| Zone 8reference | Sowing or planting | Sowing or planting | Sowing or planting | Harvest | Harvest | Harvest | Harvest | |||||
| Zone 9 | Harvest | Sowing or planting, Harvest | Sowing or planting, Harvest | Sowing or planting, Harvest | Sowing or planting | Harvest | Harvest | Sowing or planting, Harvest | Sowing or planting, Harvest | |||
| Zone 10 | Sowing or planting | Sowing or planting, Harvest | Sowing or planting, Harvest | Harvest | Harvest | Harvest | Harvest | Harvest | Sowing or planting | Sowing or planting |
- Zone 6
- −23 to −18 °C (−10 to 0 °F): high mountains
- Zone 7
- −18 to −12 °C (0 to 10 °F): upland Britain, eastern France, the Alps
- Zone 8
- −12 to −7 °C (10 to 20 °F): most of the UK and France
- Zone 9
- −7 to −1 °C (20 to 30 °F): south-west England, Brittany, Atlantic and Mediterranean coasts
- Zone 10
- −1 to 4 °C (30 to 40 °F): Isles of Scilly, the French Riviera, coastal Corsica
Indicative months. A cold year or a garden at altitude shifts everything by a month; watch the frosts too.
Leeks in practice
- Spacing
- 15 cm along the row, 30 cm between rows
- Sun
- full sun
- Watering
- moderate
- Difficulty
- moderate
- In a pot
- yes
- Support
- none
- Family
- Alliums (Amaryllidaceae)
Good companions for leeks
Keep apart
Questions about leeks
When to plant leeks?
In zone 8: plant out from April to June. The four other zones are in the calendar above; at altitude or after a long winter, aim for the end of the window.
How long until harvest?
About 150 days after planting in zone 8, then the harvest lasts about 90 days.
How far apart?
15 cm between plants along the row and 30 cm between rows.
Can you grow leeks in a pot?
Yes, in a deep enough pot, in the sun shown above. Soil dries fast in a pot: watch the watering more than in the ground.
What to plant nearby?
Good companions: carrot and celery. Keep apart: broad bean, dwarf bean, climbing bean and pea.
Updated 20 October 2026, Hortipix catalogue version 1. Windows still being checked against Le Guide Clause, Vilmorin and Terre vivante (RHS and Cornell for the UK and the US), compared with OpenFarm (CC0). They remain indicative.