If you have a heavy, clay soil, comfrey is an excellent choice to help make space in the ground for your Bonfire Patio Peach Tree to put down good roots. Planted in the winter while the peach tree is dormant, your tree will be able to grow plenty of roots, given good nutrition, so that it might even be possible to get fruit the first year from your grafted fruit tree. 

Though strawberries may not fruit beneath the shady canopy of the Bonfire Patio Peach Tree, as they run to the edges, looking for light, you'll have grown a thick ground cover that holds in moisture and creates a great environment for soil life right beneath the tree. This will help to build soil nutrition for the Peach Tree and for the strawberries, which, after getting established some place more sunny, will give you strawberries around the shady part of your peach tree. 

A fast-growing, edible grass-type plant that will fit beneath any tree. Apsaragus grows well in shade or sun and as it gets taller, will make its way through the branches of the dwarf Bonfire Patio Peach to give it a bit of shade during unforgiving summers. 

If you're looking for something that is color complimentary and edible, then Victoria Rhubarb will be the way to go. Its strong roots help crack the osil and its wide, large leaves help to cover the soil, keeping in more moisture for both the rhubarb and the Bonfire Patio Peach Tree.