December 15
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Plant Species of the genus Juglans

Information about this genus
Name: Juglans
Cultivation: CULTIVATION: Walnuts thrive on deep alluvial soils, preferably with a high organic content, well drained and with an assured water supply, in a cool humid climate. Commercial orchards of English walnuts are, paradoxically, more common in western USA than in Europe. Plantation trees are often severely pruned after 1 year to force strong single trunk growth, then stopped at 12 ft (3.5 m) or so to induce lateral branches; ornamental trees may be treated the same way. Seeds can be collected as soon as ripe in early autumn and stored in cool conditions until it is sown in early spring. Clone material is usually increased by budding onto 1-year-old seedling understocks in late spring or by apical grafting in late winter or early spring.
Description: The walnuts, a genus of about 20 species of deciduous trees, are distributed over the temperate zones of the Americas, southeastern Europe and Southeast Asia. They have alternate compound leaves and monoecious flowers, borne in spring. The fruit is a hard-shelled nut enclosed in a fleshy green drupe, the kernels being much prized for food. Several species are of considerable ornamental value, mainly for their handsome form and foliage; some produce a hard and often beautifully grained wood that is valued for furniture making and the stocks of high-quality shotguns. The English walnuts are generally the first choice for nuts, the American species for ornament and timber. Some species produce a substance in their roots called juglose that can be poisonous to apple trees.

Specie Vernacular Zone
cinerea 4-9
Juglans 3 bixbyi 4-9
Juglans ailanthifolia 4-9
Juglans cathayensis 5-10
Juglans hindsii 8-10
Juglans major 9-11
Juglans mandshurica 4-9
Juglans microcarpa 7-10
nigra 4-10
regia 4-10

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