Dig a hole that is a few inches deeper and wider than the spread of the roots. Set the tree on top of a small mound of soil in the middle of the hole. Be sure to spread the roots away from the trunk without excessively bending them.
For container-grown trees, remove the plant from its pot and remove any circling roots by laying the root ball on its side and using clean shears to cut through the offending roots. (Keep root pruning to a minimum, overall.)
For grafted trees, position the inside of the curve of the graft union away from the sun when planting.
Tip: Especially for dwarf or semi-dwarf grafted trees, the graft union must be 2 to 3 inches above the soil surface. If it’s any lower, the grafted tree (called the scion) may start to put out its own roots and grow into a standard-size tree.
Do not fertilize at the time of planting.
If you are planting standard-size trees, space them 15 to 20 feet apart. Space dwarf trees 10 to 12 feet apart.
Most types of peach trees are self-fertile, so planting one tree is all that’s needed for fruit production.