I used to live on a property with many black
walnut trees but we didn't bother eating the nuts because the shells are much harder than
English walnuts and you have to use a sledgehammer to crack them, which of course then smashes your nut.
uglans regia, the Persian
walnut,
English walnut, especially in Great Britain, common
walnut, or especially in the US, California
walnut, is an Old World
walnut tree species native to the region stretching from the Balkans eastward to the Himalayas and southwest China.