Royal Walnut

Royal Walnut is the catalog name for Juglans regia, also called English walnut and Persian walnut. This deciduous tree is valued for its edible walnut and broad, spreading crown. ## Identification and garden use Oregon State University describes a rounded to open, spreading tree typically 40–60 feet tall, with grayish bark and pinnately compound leaves. Its fruit is the familiar walnut of commerce. The genus name Juglans is the classical Latin name for the walnut, while regia means “royal.” ## Growing conditions Plant in sun and provide deep, light, loamy soil with good drainage; the species does poorly in wet or poor soils. Oregon State University lists it as hardy to USDA Zone 6 (with Zone 5 noted parenthetically). The existing catalog size range is retained as a practical planning estimate; mature dimensions vary among trees and growing conditions. Many cultivars of J. regia are grown commercially, so named selections may differ from this species-level profile. ## Seasonal interest Leaves emerge in spring, while foliage and fruit add fall interest. Allow ample room for the spreading crown and for fallen nuts and leaves. For cultivar-specific harvest timing, pollination needs, and final size, consult the selected cultivar’s growing information. ## Sources [Oregon State University Landscape Plants: Juglans regia](https://landscapeplants.oregonstate.edu/plants/juglans-regia) ## Maintenance Choose a sunny, well-drained site with enough space for the mature canopy. Avoid persistently wet or poor soil, and gather fallen nuts and leaves where a tidy surface is desired.