In article , Nick Hogg
writes

anyway, after what Alan Gould has said above, i'm thinking i should maybe
put the tree back outside - it's in a conservatory right now - although i'd
be worried that this new growth, being quite delicate at the moment, might
be killed if there is a frost ...

We have our 2 yr. old Olive growing in an unheated greenhouse but
planted next to the glass. There it just caught a degree or two of frost
last week, but it enjoys higher temperatures all summer than it would do
outside. We don't think it will fruit this year, but we have high hopes
for having some home grown organic olives later on.
--
Alan & Joan Gould - North Lincs.