thank you for fed back. I will most probably need to find the dwarf variety of trees if i were to plant them in a green house or be very avid on spacing and tree and pruning hight. I guess the reason i thought up this question was if it were possible to grow these tropical trees in southern Ontario between 2 hugelkultur beds and used the one side as a solar gain( putting rocks along the one side of the bed keeping the top and opposition side to plant veggies other such things,) to heat them passively in the winter I would then use this also for grapes . I will probably need to cover them in the winter months as temperatures can fluctuate i will have to develop this idea some more .
thank you so much again for the feed back so quick