I'm looking for some information on fruit tree growth habits, more specifically regarding root spread and invasiveness (if that's a word... lol). I have 2 different types of fences in my slope where I'd like to plants fruit trees. The back fence is a half brick fence with wrought iron on top and the sides are 6' wood fences. I'm also concerned about roots lifting the concrete patio.

I've read that avocado roots are spreading and will eventually will lift foundations. I've also read that it will strangle other trees near by. Is that true? How much space would be needed per avocado tree? I have a hedge of about 35 trees in a 12x65 area with 4 trees deep and 10 wide. It sounds like I wouldn't be able to add avocados to the end of the hedge.

I'm also considering planting Asian pears along the fence line. Would the roots be a concern there too? Are any fruit trees safe by the fence? I also have apples, pears, plums and peaches I could move to the fence line instead.

Sorry if this is so long but I want to make sure that I have planned this out correctly for the long term. Thank you!

Sandra