I planted 25 Dunstan chestnut trees here in southern Iowa. They never produced and never survived passed the third year. I also had a few neighbors plant them with the very same results. Would never waste my time, energy or money on planting Dunstan chestnut trees. I done soil testing and even spoke to the people I bought them off. I done everything humanly possible for the trees survival and nothing. To me, they are not suited for the Iowa climate, (which I was told different by the company), or a gimmick.