When to plant cauliflowers
In zone 8, most of the UK: plant out from April to June and in August. First harvest about 90 days later.
Growing stages
Cauliflowers: 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 | Harvest | |||||
| Zone 8reference | Harvest | Sowing or planting | Sowing or planting | Sowing or planting, Harvest | Harvest | Sowing or planting, Harvest | Harvest | Harvest | Harvest | |||
| Zone 9 | Harvest | Sowing or planting | Sowing or planting | Sowing or planting, Harvest | Harvest | Harvest | Sowing or planting, Harvest | Sowing or planting, Harvest | Harvest | |||
| Zone 10 | Harvest | Harvest | Harvest | Sowing or planting | Sowing or planting | Harvest |
- 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.
Cauliflowers in practice
- Spacing
- 60 cm along the row, 60 cm between rows
- Sun
- full sun
- Watering
- high
- Difficulty
- demanding
- In a pot
- no
- Support
- none
- Family
- Brassicas (Brassicaceae)
- Watch for
- slugs and birds
Good companions for cauliflowers
Keep apart
Questions about cauliflowers
When to plant cauliflowers?
In zone 8: plant out from April to June and in August. 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 90 days after planting in zone 8, then the harvest lasts about 20 days.
How far apart?
60 cm between plants along the row and 60 cm between rows.
Can you grow cauliflowers in a pot?
Open ground is better: the crop needs room and depth that a pot does not give.
What to plant nearby?
Good companions: dwarf bean and celery. Keep apart: strawberry and tomato.
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.