Juglans californica Juglans californica Juglans californica
Juglans californica var. californica Juglans californica var. californica Juglans californica var. californica
Juglans californica var. californica Juglans californica var. californica
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
    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