Phoenix roebelenii. Pygmy date palm
 

I've just purchased a Phoenix Roebelenii which is around 1m tall and was wondering what is the best method for feeding them. Should I plant it directly into the ground or move it to a larger pot?
I'm in the UK, so there is a risk of frost, how can they be protected against frost in the winter as it's too big to bring indoors?

Thanks.

Blairadamwitch