I ordered my crab apple seedlings from the Georgia Forestry Service. They sell a variety of trees at very good prices. Ten crab apple seedlings were $30, much cheaper than I could have gotten them anywhere else. They start taking orders in June for delivery to your nearest Forestry Service office in December or January, the time to plant them. i wanted to order some persimmon trees, but they were sold out by the time I tried to order.
Since my soil is poor I bought some bags of topsoil at Lowes and a bag of 10-10-10 fertilizer. I also took some wire I had and made tubes to protect the saplings from deer and other animals. To plant, I dug a hole a little deeper than the seedlings had been growing and much bigger than the root spread with post hole diggers. I put the sapling in and added topsoil, compacting it as I added it. When the hole was full I poured water on it to settle it good and sprinkled a cup of fertilizer around it about a foot out. After staking the cages down securely I flagged them with surveyors tape.
I also fertilized some wild persimmon trees in my field and a white oak tree as well as some saw tooth oaks I planted a few years ago. I have been watching about a dozen persimmon trees that came up in my field, hoping to see some fruit so I would know they are female trees. I finally saw some persimmons on this group of trees this year so I fertilized them.I hope to harvest venison around these trees in three or four years.