SelecTree: Tree Detail
Photo Locations: Claremont, CA, Nipomo, CA, Hoyt Arboretum - Portland, OR and Arnold Arboretum - Boston, MA.
Resistant to crown rot. 'Payne' is most common variety. Blackline disease disease may occur on black walnut rootstock. Honeydew from aphids may be a problem.
Has fragrant Leaf.
Native to Southwestern China.
A Juglans regia in Porterville is registered as a California Big Tree. It measures 62 feet high, with a trunk circumference of 197 inches and a crown spread of 96 feet.
Additional Common Names
ENGLISH WALNUT, PERSIAN WALNUT
Spreading with a High Canopy.
Rounded or Umbrella Shape.
Has Deciduous foliage.
Height: 60 - 100 feet.
Width: 50 - 60 feet.
Growth Rate: 36 Inches per Year.
Longevity 50 to 150 years or more.
Leaves Pinnately Compound Odd, Medium to Dark Green, Bronze or Gold, Deciduous.
Flowers Inconspicuous. Flowers in Spring. Has separate male and female flowers on the same tree (monoecious).
Prolific, Brown or Mostly Green Nut in Fleshy Husk, Large (1.50 - 3.00 inches), fruiting in Fall Edible.
Bark Light Gray, Smooth.
Shading Capacity Rated as Moderately Dense in Leaf.
Shading Capacity Rated as Moderately Low out of Leaf.
Litter Issue is Dry Fruit.
Tree Site Conditions & Constraints
Sunset Zones 4 - 9 and 14 - 23.
USDA Hardiness Zones 3 - 7.
Exposure Full Sun to Partial Shade.
Moist to Dry Soil.
Clay, Loam or Sand Texture.
Highly Acidic to Slightly Alkaline Soil pH.
Seaside Tolerance is Good in Mild Zone.
Pests & Disease Information
Resistant to Crown Rot and Verticillium. Susceptible to Aphids, Husk Fly, Scales and Spider Mites, Anthracnose, Bacterial Blight, Canker, Chlorosis, Crown Rot, Mistletoe, Oak Root Rot, Phytophthora, Root Rot, Sooty Mold and Virus.
Health, Safety & Environmental Concerns
Branch Strength Rated as Strong.
Root Damage Potential Rated as Moderate.
Allergy Health Hazard.
Biogenic Emissions considered Moderate.
Desirable Wildlife Plant.
Attracts Birds and Squirrels.
Cite this tree:
SelecTree. "Juglans regia Tree Record." 1995-2017. Dec 10, 2017.
< http://selectree.calpoly.edu/tree-detail/juglans-regia >