‘In the depths of winter I finally learned that within me there lay an invincible summer.’ – Albert Camus
We don’t associate December much with growing anything from seed. It’s more about keeping warm if you’re working outside and checking on all those last minute jobs to be done before winter really takes a hold.
However, you can grow alpines sown from seed because they love a cold break to wake them up. What they don’t like is being excessively wet, so put a sheet of glass over where they are growing using bricks to support and hold down the sheet, effectively making a glass tunnel.