1. Walnuts should be kept in a ventilated place as far as possible. Be careful not to use sealed bags. It is best to use cloth bags, sacks or other bags with good air permeability, which is beneficial to ventilation of walnuts, preventing moisture regain and mildew, thus prolonging storage time. Walnuts should be preserved with skin.

2. Walnut, a plant of Juglans in Juglandaceae, together with almond, cashew nut and hazelnut, is known as the world-famous "four dried fruits" and is one of the nut foods deeply loved by the people.

3. Walnut is rich in nutritional value, and has the reputation of "Long live the child", "longevity fruit" and "treasure of health preservation". Walnut is rich in nutrients such as fat, copper, magnesium and potassium.

4. China is one of the centers of origin of walnuts in the world, and it is also the largest country in walnut production in the world, with the largest planting area and output, and the second largest export volume after the United States.