Have grown a variety called Groninger for over a decade and a half now. They are De Ree seeds.
I grow them in the same bed that grows my Broad beans. Once the broad beans have finished and pulled up I mix in a load of homemade compost, check the ph (its always fine) and then plant out the sprouts that I start off from seed in the greenhouse.
Have those Sprouts from Autumn through to late Winter.
They are very tasty sprouts, good size and produce beautiful Brussel Sprout tops.
I also grow some in a small raised bed.
I did for a few years also grow Crispus F1 as well as my Groninger. They cropped well as medium sized sprouts. Cropped very early, producing late September to late December.
Found after that, in January they all popped.
They did not have any kind of a top that survived if you like Brussels Sprout tops.
Other varieties I have tried over the years that have not been as good and frankly disappointing.
Evesham tasted lovely, but the plants were small and not that great a yield per plant.
A couple of real failures for me;
Camelot produced large tops but the sprouts were never tight, so all of the sprouts blew on growing.
Windsor produced mostly small sprouts and were very sweet. The yield was poor. They did however produce fair tops.
Only problems I find with Brussels Sprouts are the cabbage white are attracted towards them.
As I have said on here before, I use my homemade cabbage white dummies and do not get any problems from them once they are deployed.
It may be worth covering them for you, but I do not as my dummies work well here.
Have not known anything else attack them.
My tips that has worked for me;
Plant the out in the ground firmly.
I have early in the sprout forming season had the occasional blown one and picked it off. Have been told this stops others doing the same. It has always worked for me with my Groninger and tend after that initial one or two, have no more blowing.
Check that the base of your plants stays firm. I do earth up a few times during their growing time and firm it in well. I also in Autumn wrap a few strings around the cropped area to help with them not bending over too much in any strong winds.
Tend to let the rain do the watering for them, so be careful not to overwater. They will not be happy in soggy ground.
My crop is coming to an end now. Here is some of them I picked this morning.
The top and nicely formed prepared sprouts ready for steaming later.