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Successful planning can result in a year-round cauliflower crop. Some care is required with white varieties during spring and summer months to prevent yellowing.

Exposure to the sun can cause the heads of white cauliflower varieties to turn yellow, in some cases a light off-purple or off-grey colour, however, the seeds stocked here at Growseed are prone to yellowing more so than purple.

Some white cauliflower varieties are self-wrapping, which helps prevent this process from occurring.

Self-wrapping refers to when the leaves of the cauliflower grow to cover the head of the vegetable.

For varieties that are not self-wrapping, a simple method can be used to produce the creamy-white heads that many look for in cauliflower. If your cauliflower does suffer from yellow staining from the sun, you can still eat it! No need to compost the plant. The creamy white cauliflower is often a feature sought after if you are running a market garden!

Follow these tips for uniformly whiteheads.

The time to start protecting the head is when the developing heads are just visible through the leaves, about 1–2" in diameter (it will look like sprouting broccoli)

Gather the outer wrapper leaves and pull them over the heads, securing them together with garden twine, wire can be OK however in wind will rub too harshly against the leaves and risk damaging the plant.

Another method is to lightly break or "crack" the midribs of the leaves and fold them over the head until it is completely covered. Do not break the leaves, or they may blow away, nor should you bend them at the base as they will fall off and damage the plant's growth.

Check the heads as they develop.

Tied or covered heads may be subjected to increased humidity levels, increasing their susceptibility to diseases such as Alternaria.

The above method is only required during spring and summer crops, it becomes less important in the cooler, shorter days of autumn. Please note there is no need to tie the leaves around the heads of coloured cauliflower varieties (purple, yellow, green, orange) —  they need exposure to sunlight to achieve the deep colouring!

Season Cauliflower Varieties Sowing Period Harvesting Period Cold Tolerance Heat Tolerance Days to Maturity
Winter/Spring Snowball Late Summer to Early Autumn Late Autumn to Early Spring High Moderate 55-80
Late Summer Romanesco Spring to Early Summer Autumn Moderate Moderate 75-100
All Seasons All Year Round Throughout the year Depends on sowing time Moderate Moderate 70-85
Spring/Autumn Clapton F1 Early Spring/Late Summer Late Spring/Early Autumn Very High Low 80-100
Spring/Autumn Grafiti F1 Early Spring/Late Summer Late Spring/Early Autumn Moderate to High Moderate 70-90
Spring/Autumn Sunset F1 Early Spring/Late Summer Late Spring/Early Autumn Moderate to High Moderate 75-85

  • Snowball: A classic variety known for its hardiness and is best for cooler growing conditions.
  • Romanesco: Distinctive for its fractal shapes and nutty flavor; it's more sensitive to extreme temperatures.
  • All Year Round: As the name suggests, this variety can be planted at any time of the year but prefers milder temperatures.
  • Clapton F1: A resilient variety that is particularly noted for its clubroot resistance, usually sown in periods to avoid the hottest part of the year.
  • Grafiti F1: Known for its purple heads, this variety is both decorative and tasty, with a good cold tolerance.
  • Sunset F1: This variety offers orange-colored heads, which contain a significant amount of beta-carotene.