Suitable for cool temperate climate and moderate altitudes.
Black Walnut
Juglans nigra, commonly known as eastern black walnut, is a fast-growing tree native to North America. It produces large, flavorful nuts that retain their taste when cooked. The tree also has valuable timber, although it is less visually appealing compared to other walnut species.
Juglans nigra
United States
- The wood of the black walnut tree is highly valued for its strength and quality, commanding high prices in the timber market. - Unlike other commercial nuts, the flavor of black walnuts remains intact even after cooking. - In terms of nutritional composition, black walnuts contain 3.1% water, 628 calories, 14.8g carbohydrates, 59.3g fat, 20.5g protein, 2.3g ash, trace amounts of calcium, 460mg potassium, 3mg sodium, 190mg magnesium, 6.0mg iron, 570mg phosphorus, 300 I.U. of vitamin A, 0.22mg thiamin, 0.11mg riboflavin, and 0.7mg niacin. They also have a digestion time of approximately 3 hours. - The bark of the black walnut tree is used as an astringent, the leaves as a detergent, and the rind as a remedy for liver-related issues. - The bark can be brewed into an infusion or decoction to treat diarrhea, suppress milk production, or used as a mouthwash. - The green rind of the nut is used as a poultice for treating ringworm. - Black walnut trees are commonly used as rootstocks for budding J. regia. Grafting is often avoided in favor of budding. - It typically takes 10-12 years for a Juglans nigra tree to start producing nuts.
The Eastern black walnut prefers deep, well-drained soils with a pH range of 6.0 to 7.5.
This species is a large (to 33 m), fast growing native of North America. It has a good, strong timber, but is less attractive than J regia. Nevertheless, extremely high prices are paid for the timber. In the USA one log fetched $30,000 in 1986.
The nuts are unique among commercial nuts in retaining their flavour when cooked. Nutri-tional composition of the black walnut per 100 grams of edible portion is: Water - 3.1 %, Energy - 628 calories, Carbohydrate - 14.8 g, Fat - 59.3 g, Protein - 20.5 g, Ash - 2.3 g, Calcium - trace, Potassium - 460 mg, Sodium - 3 mg, Magnesium - 190 mg, Iron - 6.0 mg, Phosphorous - 570 mg, Vitamin A - 300 I.U., Thiamin - 0.22 mg, Riboflavin - 0.11 mg, Niacin - 0.7 mg and the digestion time is 3 hours.
The bark is used as an astringent, the leaves as a detergent, the rind as an hepatic. The bark infusion or decoction is taken for diarrhoea, to stop milk production and as a mouthwash. For ringworm the green rind of the nut is used as a poultice.
This tree is used as a root -stock for J. regia (budding is used in preference to grafting).
- Juglans nigra (Eastern black walnut): Generally takes 10-12 years to start producing nuts.