Space saving techniques
Trees shaped to a single trunk can be spaced as close as 1m apart and grown as a fruiting hedge. For cross-pollination, two or more trees can also be planted into one hole.
Trees grafted with two or three different varieties of the same genus are commercially available and can be found with cross pollinating varieties for fruits that need a pollinating partner.
Miniature peaches, nectarines, apples, plums and pears are available along with narrow, columnar fruit trees that do not need pruning
Citrus can be bought grafted onto dwarf 'Flying Dragon' rootstock.
If you have a north or west facing wall, trees can be trained alongside, using an espalier trellis. This is suitable for apricots, Japanese plums, nectarines, figs, mulberries, peaches and persimmons. Apples and pears prefer south or east facing walls in warm winter areas like the coastal areas of Perth.
In small patios or balconies, miniature fruit trees and blueberry bushes can be grown in containers and all fruit trees can be kept to a manageable size by pruning.