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View crop Data sheet EcoPortJuglans nigra
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| DESCRIPTION: Deciduous tree reaching 25-50 m in height. It develops a long, smooth trunk and a small rounded crown when growing in the forest. In the open, the trunk forks low with a few ascending and spreading coarse branches. The root system usually consists of a deep taproot and several wide-spreading lateral roots. The bark on young trees is dark and scaly but becomes darker with rounded intersecting ridges on mature trees. USE: The wood is heavy, strong. It is used principally for furniture, radio, television and piano cabinets; and as an interior finish. The veneer is used for the highest grade cabinets and plywood panels. The nuts are used as food by humans and are harvested commercially. The nuts are eaten plain or with honey and used to flavour cakes, candy, and ice cream. Native Americans used the nuts for food and extracted black dye from the roots. The tree is cultivated as an ornamental. GROWING PERIOD: Perennial. The tree mature in about 100 years and may live and produce nuts for up to 250 years. Growing period from April-May to September-October. COMMON NAMES: Black walnut, American black walnut, Eastern walnut. FURTHER INF: Black walnut is a native of eastern and central United States. It is found on a variety of sites. Good agricultural soils are generally favourable, whereas it grows slowly on wet bottomlands, dry ridges, and slopes. Common tree associates include American elm (Ulmus americana), hackberry (Celtis laevigata), green ash (Fraxinus pennsylvanica), box elder (Acer negundo), and butternut (Juglans cinerea). It is classified as shade intolerant. In mixed forest stands, it must be dominant to survive, although it can survive in the relatively light shade of black locust. | Sources |
| SOURCES Hartmann T 1981 pp 606-607 [ Roecklein J 1987 pp 414 [USE] Duke J 1975 pp 19 [PH, RAIN, TEMP] Woodroof J 1979 pp 604-615 [DEP, DRA, FER, TEXT, PH] |