It can be eaten. Walnut peel can soften blood vessels and has good therapeutic effects in anti-cancer. Green walnut peel also has the functions of clearing heat and detoxifying, diuresis, removing dampness and heat, reducing swelling, killing insects and relieving itching. .

Extended information:

Walnut, likes light, is cold-resistant, has strong drought and disease resistance, adapts to a variety of soil growth, likes fertile and moist sandy loam, likes water, fertilizer, and Yang, at the same time, the requirements for water and fertilizer are not strict. It is not suitable to prune branches after falling leaves and before germination, as it is easy to cause bleeding. Suitable for growing on most land. It likes calcareous soil and is common in places with deep soil layers on both sides of mountain valleys.

Walnut, also known as walnut and peach, is the most widely cultivated at home and abroad. Deciduous trees are generally 10 to 20 meters tall, with a maximum height of more than 30 meters, a trunk diameter of about 1 meter, and a lifespan of one to two hundred years, with the longest being more than 500 years old. The crown of the tree is open and semicircular or round-headed, with a diameter of 6 to 9 meters.

The bark is grayish white to dark brown, the bark of young trees is smooth, and the bark of old trees has irregular shallow longitudinal cracks. The branches are thick and smooth. The young branches are green when they are first born, and may also be slightly red in early spring. After they stop growing, they turn to bright gray or gray-brown with white lenticels. The pith of annual branches is larger and the xylem is soft. As the age increases, the pith gradually becomes smaller.

The leaves are odd-pinnate compound leaves, alternate, 30 to 40 cm long, with rounded petiole, enlarged base with glandular spots, and large, triangular leaf scars after falling off. Leaflets 5-9, oblong, obovate or broadly elliptical, with short stalks, slightly pointed apex, and entire or slightly serrated leaf margins.

Walnuts are rich in nutritional value and are known as "Long Live Fruit", "Longevity Fruit" and "Treasure of Health". 86% of the fat in walnuts is unsaturated fatty acids. Walnuts are rich in copper, magnesium, potassium, vitamin B6, folic acid and vitamin B1. They also contain fiber, phosphorus, niacin, iron, vitamin B2 and pantothenic acid. Every 50 grams of walnuts contains 3.6 grams of water, 7.2 grams of protein, 31 grams of fat, and 9.2 grams of carbohydrates.

Walnuts are sweet in taste and warm in nature, and enter the kidney, lung, and large intestine meridians. It can nourish the kidneys, strengthen the essence and strengthen the waist, warm the lungs and relieve asthma, and moisturize the intestines and relieve constipation. Indications: Kidney deficiency, asthma, cough, and low back pain; (woody compartment in the nucleus) is bitter in taste and warm in nature; nourishes the kidneys and astringes essence.

Reference: Baidu Encyclopedia---Walnut