Large purple flower heads to 1.2kg; heads lose their purple colour when cooked and turn green.  Purple cauliflowers are easier to grow than white varieties. 190 days to maturity.
 
Germination
Sow cauliflower seeds 6mm deep spacing plants about half a metre apart.
Cauliflowers require cold weather to encourage them to produce a head of florets.
To achieve the required amount of chilling, they need to be sowed at certain times:
In cold regions, sow from mid-Spring to late-Summer.
In temperate regions, sow from mid-Summer to late-Autumn.
In the sub-tropics, sow from early-Autumn to early-Winter.
And in the tropics, sow from mid-Autumn to mid-Winter.
 
Cultivation
Keep well-watered. Heavy feeder.  Prefers rich, free-draining soil.  Incorporate compost into the soil prior to planting if lacking in organic matter.  Add garden lime to the soil if acidic.
Tolerates frost once established.  Cover the developing heads with the leaves, loosely tying them in place with string, to prevent the bright purple heads from fading in the sun.