I tried to grow cauliflowers years ago with no joy, this year i planted in my tunnel some brussels, looked on them today and i have a cauliflower a good 6 inches wide, no idea where it came from i thought i only planted brussels, now all i do with the plants in the tunnel is to put down some slug food
and they get watered at night on a timer, have a cursory glance and check things over each day and see how big my brussels and onions and carrots are getting, i have had no trouble with caterpillars or anything like that, so maybe the key to growing cauliflowers is to ignore them