Purple sprouting broccoli

in Fruit & veg
Need any advice on how to grow purple sprouting broccoli. Best time to sow seeds, transplanting, soil type, watering, winter protection? I've read online that you can leave them over winter in the garden but nothing is mentioned about if I can leave them in the frost or snow.
Thanks in advance
Thanks in advance
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You will also need to net them against the cabbage white butterflies in the summer.
All the information you need is here https://www.gardenersworld.com/how-to/grow-plants/how-to-grow-purple-sprouting-broccoli/
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.