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Nuts mature throughout the summer and are harvested in the fall from mid-September through early November. Harvesting in Walnut Farming:- Usually, walnut trees will become ready for harvesting in 10 to 12 years after planting the seedlings. One can expect full commercial production after 18 to 20 years from planting time.Persian walnut is the most important temperate nut grown in India. It is mainly grown in Jammu & Kashmir, Himachal Pradesh, Uttar Pradesh and Arunachal Pradesh. In India walnuts are grown in Arunachal Pradesh, Himachal Pradesh, Uttrakhand and Jammu and Kashmir. Walnuts is imported also from the United States (US) and Chile