persimmon trees are a great addition--it might take 5 to 7 years before they start making fruit though. Only female trees produce fruit---if you can find some small runners off a female tree and dig those runners up and replant that will help.
I read to plant most fruit bearing trees on the south facing side of a field so they get the most possible sunlight. Makes perfect sense. My ten year old sawtooths that are open to the south are way ahead of the others. I have noticed the same on wild persimmons.