Botanical Name: Juglans californica
Common Name: Southern California black walnut
Type of Plant: dicot: tree
Character deciduous
 
Habit of Growth:
Overall Shape an erect, mostly multi-trunked plant, with ascending and spreading branches forming a rounded, somewhat open canopy; unpruned plants tend to become very shrubby
Height 15-30' (50')
Spread 3/4 to equal
Growth Rate mod-rapid
 
Environment:
Exposure outdoors full or partial sun
Soil prefers a deep loam; tolerates most except dry alkaline
Hardiness hardy (zones 18-24); thrives in warm sunny coast
 
Morphology:
Leaves odd-pinnately compound, alternate, 6-10" long; leaflets are lanceolate-oblong, 11-19, 1-3" long, smooth, finely serrate, aromatic
Flowers monoecious; staminate flowers are in drooping catkins, pistillate flowers in small spikes at ends of branches; spring
Fruit drupaceous nut:1/2-1" diameter w/leathery husk;smooth shell
 
Propagation:
seed
 
Usage:
attractive small accent tree valued for form and foliage; suitable for large background shrub or screen, good for dry slopes, informal landscapes; resistant to oak root fungus
 
Landscape Care:
Watering occasional deep soak; very drought-tolerant after established
Fertilizing very little required
Pruning as a tree, head high when young; little pruning necessary
Pests/Diseases aphids, sooty mold, scale
Special Conditions/Other
 
Origin: Southern California
Family: Juglandaceae

Notes:
 
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