We want the roots to get well established before the rest of the tree takes.
Spread a layer of organic mulch inches deep over the root zone and beyond for a foot or two to help hold in soil moisture. You can use hay, straw, leaves, pine needles, grass clippings or compost. Do not use mushroom compost as this contains lime and will raise the pH.
Do not fertilize at planting time. Begin training your young peach tree now. Sep 02, Types of Mulch for Trees. You can mulch around trees with standard bark mulch, or you can use wood chips or shredded leaves.
There is nothing wrong with using wood-chip mulches as long as you age them first. If you decide to apply a leaf mulch, use shredded leaves whenever possible because they break down more quickly than whole leaves, thus releasing nutrients more quickly.