California Walnut
Juglans californica
Juglandaceae · broadleaf deciduous tree · native
Last updated
Quick Facts
Height
40 ft
Growth Rate
Medium
Light
Full Sun
Soil
Moist
Water
Moderate
Hardiness
Zone Zones 8a–8b
Fall Color
Brown, yellow
Origin
southern California, approximately from Santa Barbara to
Watch for this season
Phytophthora Root RotModerate
Growing Season Stress Expression
Crown GallMonitor
Dormant in Soil
Diseases: Regionally Documented (10)
Geosmithia morbida (vectored by Pityophthorus juglandis) Thousand Cankers Disease Xanthomonas arboricola pv. juglandis Walnut Blight Blackline virus Blackline Ophiognomonia leptostyla (syn. Gnomonia leptostyla) Anthracnose Blotch Black Walnut Toxicity Rhizobium radiobacter (formerly Agrobacterium tumefaciens) Crown Gall Pseudomicrostroma juglandis (syn. Microstroma juglandis) Downy Leaf Spot Mosses and Lichens Phytophthora spp. (P Phytophthora Root Rot Pratylenchus penetrans (primary) and P Nematode, Root-lesion
Pests: Regionally Documented (6)
Data Maturity Structured Multiple sources. Expert review underway.