When to plant companion plants around fruit trees?

I am propagating and planting fruit tree cuttings in groups of 3, so that the roots cause the trees to dwarf each other. I am going to use wood chips as a mulch, and leave the tree trunks space from the wood chips as to not spread disease.
My concern is that young trees from cuttings are very delicate in that they have very little established rooting, and want to encourage root growth and prevent root competition from any companion plants or weeds. I am wondering if I should hold off on planting companion plants for a certain amount of time, or avoid certain plants altogether?
Also, any advice on propagating and planting fruit trees would be appreciated. I am planting almonds, peaches, pears, figs, cherries, and apples. I am in zone 6a. Cincinnati, OH.