Hi, I've tried growing these the past 2 years with little success. Even if I start the plants early they take ages before they grow a 'head' and it's often tiny. I think I had one decently formed head out of around 15 plants last year - well it was the size of a child's hand, so not exactly huge. The rest were just starting to get the right shape when the first spell of cold weather (slight chill in Autumn) turned them to mush - they went really slimey, yuk. They just don't seem to be cold tolerant at all, and we live down south so they should stand some chance. Perhaps I'm doing something wrong?
On the same theme, never seem to have much luck with cauliflowers either, and my purple sprouting never forms a big head, only little ones, though I still get a decent crop over a long period. Am I missing something?