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Not an expert but I would think the most important thing is that the root doesn't freeze. Position will have a lot to do with that, and drainage, and size of pot.
Don't know what your classing as North, lots of people class Manchester as north which is a joke 😂. Up here in Cumbria we just don't have them the weather doesn't work in their favour.
I know a few people who have tried and failed, I suppose on the front of a restaurant they'll be kept sheltered and heated from the building which is probably why they are doing well. Personally I'd try a different plant that we know will tolerate the climate
They need a massive amount of grit in the compost, so that it is really free draining - Given they are growing in the Alps and high up on the Dolomites I would have thought they should survive - though I would agree with Tim, that the roots should not freeze or get waterlogged
Hi - here in Southern France they are out all year once they are hardened off. Cold and snow doesn't seem to bother them once established. However, grafted olive trees might be different - no idea :-(
Basically, as far as I know, if an olive tree is well established it can put up with a lot. However, I would never put out a young ornamental Olive Tree in a pot without some kind of protection from frost. This goes for any climate. Agree with Adam the soil needs to be rough - think of holidays in Italy, Greece etc... anywhere you see them growing.... the soil is poor and dry
Many Thanks . Not quite the frozen north but North Yorkshire .
Initially tied fleece on but they just looked depressed with leaves dropping off but since removing fleece and putting in a sheltered position they have perked up .
I did put plenty of sharp gravel in pots and watered sparingly ,and fed as required .
So far no signs of frost damage and quite lush foliage , branches are more woody than previous trees .
Someone suggested restaurant olive trees are artificial lol but I have double checked although they are next to a busy main road with plenty of fumes to breathe in .
Same garden pitosporums succumb to the cold and show signs of frost damage , I would not have recommended olive trees personally .
Weirdly my mother in law no longer here sadly lived on the north east coast but had an olive tree which just flourished , thrived on neglect and still alive with a family member but now spends winter in a conservatory .
I shall just monitor the trees for now .
The busy road will raise the temperature.