Brussels sprouts?

you are not alone......mine did the same thing and i was heart broken, i really really love sprouts.i think my soil was too loose they like to have solid ground and a good supply of humus.my soil wasnt acid.i put the muck down,feed them. so the soil is the only thing i can think off.

They need 'planting wi' an 'ammer' as my old gardening guru used to say.
However, if they do 'blow' then you may still eat them, they stir fry beautifully.

thanks for that, hope i have better luck this year,