Our answer is, unfortunately, IT DEPENDS? No one likes a Yes & No answer but this requires some explanation.
Citrus trees like lemons, oranges and limes are self-fertile (and need to be brought indoors for the winter), requiring no pollinator (which makes them popular for growing exclusively indoors; dwarf varieties are available). Most apricots, figs, nectarines, peaches and persimmons are also self-fertile; only a few varieties need a second tree to help them produce fruit.
There are also a few varieties of apples, cherries, pears and plums that don’t require a pollinator. But, most other deciduous fruit trees do need a second pollinator tree, and most of these require specific varieties to establish successful pollination. The trees don’t need to be right next to each other, practically touching but keeping them fairly close to each other can promote the best pollinating results.
Our staff of garden experts knows which fruit trees make the best pairs, or not, and will be happy to help you enhance your landscape and your pantry. Ask us!