Catching up on posting some pre-Christmas photos. This is Androsace spinulifera, grown from seed sown in 2002. I grow it in a very gritty mix with a thick collar of grit around the neck, and as I don't have a greenhouse it's left outside in all weathers all year round. I give it part shade in the summer otherwise it begins to flag. After flowering the large summer leaves die back until eventually there's nothing left in the pot but a cluster of winter resting buds, looking like Brussels sprouts but with a spiny tip to the leaves - hence the specific name.