growing brussel sprouts

can any one tell me what iam doing wrong ive tried three seasons on the the run to grow brussels every year they just open up like a rose ive tried f1 and its still the same  any help will do please 

A recurring topic-not planted firmly enough-from recently

http://www.gardenersworld.com/forum/fruit-andamp-veg/sprout-plants/75043.html

Absolutely agree with Geoff above - when planting them out you need to tread the soil really firmly around them.  If growing them in a windy spot put in a stout cane and ties to prevent wind-rock.