Ive got mine(citrus) indoors facing south.I may just leave em indoors this year,already have some babies growing,another just flowered.Thats WAAAAY early for us.Maybe the less temp fluctuating is helping?I have lemon,lime,tangerine and orange,never got an edible fruit yet,after several years.They either dont ripen in time or drop off.
True temperate trees, Oh like crab apple or some of the prunus family are really out door trees. Meaning most of them live outdoors all four seasons. They may make short visits indoors. The other 51 weeks of a year they live outside.
Some mediterainian trees, olive, bay, tarragon, thyme HAVE to be over wintered in a heated space. With some TLC they'll live from October to May here in OH with supplimental light. But, but they have to go out doors in May.
No tree lives year round indoors, for long.
Big box stores sell fig family trees by the thousand as bonsai in some cases with "indoor" directions. seeing as they've been selling them for more than a decade. You can balance the total number that have lived for the past ten years indoors on the top of your head.
My end of this argument is, the right place for a tree is always out doors when they can tolerate it.
They are indoors in an unheated space with south east poor exposure and danged if they all have fruits but the tangerine,got pinkie to first knuckle size limes,......lemon and orange babies,amazing!!!!!
My boss at the music store I worked at yrs. ago had a lemon tree about 7 foot tall. The lemons were almost as large as oranges. There would be so many on it they would have to prop the branches up with 2 X 4's.