To help reduce soil borne diseases, avoid planting cauliflowers in a garden bed where you have grown cauliflowers, broccoli or cabbages in the last 2 years.
Cauliflower grows best in soil that is fertile and soft, so ensure you enrich your soil with Yates Dynamic Lifter Soil Improver & Plant Fertiliser prior to planting.
The head or curd of the cauliflower (the white flowering head) can also get sunburnt, just like you and I. You can protect it from the sun and help keep it white by covering the top with 1 or 2 cauliflower leaves.
Regular watering will help the development of the head. Additionally, planting earlier in the season (particularly in warmer climates) will give it enough time to mature before the hot weather.