Thanks to all of you for the information. I was inspired to plant an orchard on our land in Oklahoma.
To get the planting holes ready, I dug pits about 3' x 3' x 3'. Okay, maybe I recruited my husband to help some with this part...I filled the pits with wood scavenged from the property and covered it with the dug soil. (This was before I learned the importance of keeping the soil in the original layers.)
Then, I planted the trees beside the covered mounds. This was in early 2017. After 2 years, the peach trees are 8-10' tall. They started at 3-4'. It seems impossible to me when I compare to the growth rate of my mom's trees planted in better soil. I did water the first 2 years and she probably didn't.
I tried to attach a picture, but the internet here is spotty...