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There are two major species of walnuts, the English walnut, also named the Persion walnut as it originally came from Persia, and the black walnut. The last one originated in South America.
Walnuts usually grow well in cool climates. The yield is affected negatively by high temperatures. An average annual rainfall of about 800 mm results in the best possible yield of the crop.
They are considered to be one of the healthiest foods you can consume. A great sales feature.