Walnuts are categorized into the following 3 groups***8 varieties.

1. Walnut group: walnut, iron walnut

Walnut (Latin name Juglans regia ?L.), commonly known as walnut. Trees, up to 20-25 m tall; trunk shorter than other species, crown broad; bark gray-green when young.

Grouped in the walnut family. Deciduous tree, tree height 10-20 meters, life expectancy can be more than a hundred years. Distributed in southwest China and other places. The shell of the fruit is hard, can be used to make a variety of beautiful and durable crafts; some places also pick a large shape odd iron walnut for fitness ball.

2. Walnut rowan group: walnut rowan, wild walnut, hemp walnut, jibao walnut, heart-shaped walnut.

Walnut rowan (Juglans mandshurica Maxim.) belongs to the walnut family, hickory genus. Deciduous tree, up to 20 meters high; branches extended, crown flattened round; bark gray, with shallow longitudinal fissure; young branches are with short hairs. Oddly pinnately compound leaves born on the sprouting strips of up to 80 cm long, petiole 9-14 cm long, 15-23 leaflets, 6-17 cm long, 2-7 cm wide; distribution area is located in the temperate zone, local areas can be deep into the northern edge of the subtropical.

Wild walnut (scientific name Juglans cathayensis Dode), alias hickory. Department of walnut family walnut genus, deciduous trees or small trees; and other species of the genus is the main difference is that the leaflets grow into the following densely pubescent and stellate hairs; fruiting sequence long and pendulous.

Hemp walnut is a variety of walnut. Walnut belongs to the walnut family, deciduous trees, simple as pinnate leaves. Endocarp hard, wrinkled, yellow-brown. Fruit collection in the white dew before and after, the fruit of the outer skin compost, inner fruit rinsing and drying, clean up, is what people call "walnut".

Jibao walnut (J.sieboldiana Max) is native to Japan, introduced into China in the 1930s. In Liaoning, Jilin, Shandong, Shanxi are planted. Also called Ji Bao walnut, ass walnut, ghost walnut, Japanese walnut.

Heart-shaped walnut alias Ji walnut, this species of tree morphology and Ji Bao walnut similar to its main difference in the fruit. This species is native to Japan, introduced into China in the 1930s. Now Liaoning, Jilin, Shandong, Shanxi, Inner Mongolia and other provinces and regions have a small amount of planting.

3. Black walnut group: black walnut.

Black walnut includes 16 species, distributed in North America and Latin America. The most economically valuable of these species is the eastern black walnut (J. nigra), which is widely distributed in the eastern half of the United States and southern Canada. Nuts in the 16 species of trees in the largest, most excellent wood, for the best furniture timber and plywood only.

Walnut, also known as walnut, qiangtao, for the walnut family plants. With walnuts, cashews, hazelnuts and known as the world-famous "four big dry fruit". Walnut kernel is rich in nutrients, per 100 grams of protein 15-20 grams, more fat, carbohydrates 10 grams; and contains essential calcium, phosphorus, iron and other trace elements and minerals, as well as carotene, riboflavin and other vitamins. Beneficial to the human body. It is one of the nut foods loved by the people.

Generally up to 3-5 meters high, the bark is gray-white, shallowly longitudinal, the pith of the branches lamellar, the apex of young branches with fine pilose (2-year-old branches are often glabrous). There are also up to 20-25 meters high, the trunk is shorter than other species, the crown is broad. Bark gray-green when young, gray-white and longitudinally lobed when old. Branchlets glabrous, glossy, peltate glandular, gray-green, later brownish.

Expanded Information:

. p>Growth habit

Walnut, light-loving, cold-tolerant, drought-resistant, disease-resistant, adapt to a variety of soil growth, like fertile and moist sandy loam, like water, fertilizer, sun-loving, while the water and fertilizer requirements of the water and fertilizer is not strict, after the leaves fall to the germination should not be pruned before the pruning of branches, easy to produce the wound flow. Suitable for most land growth. Prefer calcareous soil, commonly found in mountainous areas on both sides of river valleys where the soil is deep.

Therapeutic value

One, reduce the chances of depression

Walnuts are rich in omega-3 fatty acids, which can reduce the chances of depression, Attention Deficit Hyperactivity Disorder (ADHD), cancer and Alzheimer's disease.

Two, reduce the risk of breast cancer

Consuming 2 ounces of about 60g of walnuts a day, the chances of developing breast cancer and tumors is smaller.

Three, reduce the risk of diabetes

Women who consistently consume nuts five times a week have a nearly 30 percent reduced risk of developing type 2 diabetes.

The unsaturated fat in nuts is beneficial to insulin breakdown.

Four, reduce stress

Walnut oil in walnuts has the effect of reducing blood static pressure, dietary changes can better help our body to cope with external stress.

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