Our soil is very heavy clay. I've been out planting Plum tress and mixing in about 50% composted leaves and straw to enhance the soil. We do have a nice slope so the soil will always drain well.
How far apart would you recommend planting the Persimmons?
Trust in the Lord with all thine heart; and lean not unto thine own understanding. In all thy ways acknowledge Him, and He shall direct thy paths. (Proverbs 3:5-6)