I have one that has lived outside in a container for years. It was a bargain from Homebase, so was also in a pretty tiny pot when I got it.
Mine has a mainly John Innes compost, with some multi-purpose added in just to make it a bit lighter. The base of the pot has a decent layer of grit in it to ensure good drainage. When it was smaller, I used to lunk it into the greenhouse to overwinter, but it has been too big for that for a few years now. I move it into a spot where it is sheltered from the worst of the winter winds and that seems to do it.
It gets top dressed each year, usually around February. I scrape off the top layer of grit and as much soil as I can, add more JI, a scattering of fertiliser and I replace the grit. Over the summer it gets a weekly feed of whatever everything else is getting. I prune it fairly hard each summer once the main spurt of growth has slowed down, but in time for the cut ends of branches to harden off before winter.
That’s about it really
Cold doesn’t bother them too much, so long as they are not waterlogged. Cold winds can burn foliage. Over the summer they need a lot of water. Over winter not much, but the canopy acts as an umbrella, so it might need some watering.