Posted: 14/12/2014 at 16:49
I'm no expert on growing winter veg but brussels and Celeriac need a long growing season. I sowed Celeriac in March to get a crop which could start to be picked about August time and alot is still in the ground.
Brussels were sown in April/May for a crop which could be picked from October/November time.
Calabrese and Broc should be ok sown in modules to plant out later.
Kale and chad, both under rated in my opinion, but excellent winter vegs. I was put off Kale for along time thinking it was grown as animal fodder but the crinkly variety is actually quite nice. A Chad plant will last for up to 4yrs after planting out. Both can be started in modules, I'd pot up till there's room to plant out on the plot, making sure they don't get pot bound. The soil needs to be warm so the roots can get established before the first frosts, so planting no later than September gives them plenty of time.
Other's may have a different view