Thirdly, unlike the relatively easy to crack shell of the Persian walnut
, the American's shell was extremely hard, difficult to smash.
Preliminary research of Persian walnut
and correlation between pair characters // Acta Horticulturae.
Some of the Ayurvedic plants used in the formula include neem, peelu, Indian licorice, pomegranate, jujube, Persian walnut
, Asian holly oak, sappan wood, sarsaparilla and bishops weed.
Something over 23,000 metric tons of black walnuts are harvested annually in the United States, compared to hundreds of thousands of tons produced by English or Persian walnut
trees, grown primarily in California.
European walnut, French walnut, English walnut, Italian walnut, etc, Ancona walnuut, Circassian walnut, Persian walnut
and Black Sea walnut.
These include American black walnut, European walnut, French walnut, Persian walnut
and a host of others, all falling under the general species Juglans.
Black walnuts, along with other members of the Juglan genus of plants, which include Persian walnuts
and butternut, produce a substance called juglone.