Common Name	California Walnut, California Black Walnut, Southern California Walnut
Latin Name	Juglans californica
Family	Juglandaceae
Sunset zones / USDA zones	18-24 / 8-10
Type / Form	Tree / Medium
Native Habitat	California oak woodlands from 0 to 2,500 feet
Soil	Dry, decomposed granite, sand, clay loam low in organic content, well drained
Water	Twice per month once established
Exposure	Full sun
Height X Width	20 feet X 20 feet, slow growth
Protective Mechanism	None
Leaves	Green deciduous leaves
Flowers	Monoecious; male flowers in yellow-green hanging catkins, 2 to 3 inches long from last year twigs; female flowers are very small and occur on short spikes either singly or in clusters of 2 or 3 near the ends of the current year twigs, appearing in spring with the leaves. Round nut, 1 to 1 1/2 inches in diameter; husk is thin, initially bright green but turning brown; nut is shallowly grooved, maturing in fall.
Bark / Roots	Gray to brown, shallowly fissured, ridges flat topped and scaly. Stout, initially green but turning reddish brown, buds are scruffy light brown; leaf scar very large, raised and 3-lobed; pith chambered. /
Maintenance	Considerable litter, some pruning
Propagation	The seed is best sown as soon as it is ripe in individual deep pots in a cold frame. You need to protect it from mice, birds, squirrels etc. The seed usually germinates in late winter or the spring. Plant out the seedlings into their permanent positions in early summer and give some protection from the cold for their first winter or two. The seed can also be stored in cool moist conditions (such s the salad compartment of a fridge) over the winter and sown in early spring but it may then require a period of cold stratification before it will germinate.
Pests and diseases	Older limbs prone to termites and wood boring beetles
Landscape uses	Erosion control, fire retardant, background
Garden Suitability	Thornless, Mountain, Songbird, Fire Retardant
Nature Value	Nuts eaten by wildlife, provides cover and nesting
Native American Uses	Nuts eaten, wood used for tools and weapons, bark used for basketry, shells used for dice
Links
Data	http://www.fs.fed.us/database/feis/plants/tree/jugcal/all.html
Data	http://www.pfaf.org/database/plants.php?Juglans+californica
Images and data	http://www.calflora.org/cgi-bin/species_query.cgi?where-taxon=Juglans+californica+var.+californica
Images and data	http://www.wildflower.org/plants/result.php?id_plant=juca
Images and data	http://www.cnr.vt.edu/Dendro/dendrology/syllabus/factsheet.cfm?ID=519
Images and data	http://www.theodorepayne.org/mediawiki/index.php?title=Juglans_californica_var._californica&printable=yes&printable=yes
Images and data	http://en.wikipedia.org/wiki/Juglans_californica
Images and data	http://www.californiagardens.com/Plant_Pages/juglans_californica.htm
Images and data	http://davesgarden.com/guides/pf/go/68890/
Images and data	http://www.desert-tropicals.com/Plants/Juglandaceae/Juglans_californica.html
Images and data	http://www.wildflower.org/plants/result.php?id_plant=juca
Nursery, images and data	http://www.cnplx.info/nplx/species?taxon=Juglans+californica
Nursery, images, and data	http://www.laspilitas.com/plants/363.htm
Nursery	Oak Hills Nursery, 13874 Ranchero Road, Oak Hills, 92345, 760-947-6261
Distribution	http://plants.usda.gov/java/profile?symbol=JUCA

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