California Walnut, Southern California walnut

Juglans californica

Physical Characteristics

Juglans californica is a deciduous Tree growing to 6 m (19ft 8in) at a medium rate. See above for USDA hardiness. It is hardy to UK zone 8. It is in flower from April to May. The species is monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and is pollinated by Wind. The plant is self-fertile. It is noted for attracting wildlife. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It cannot grow in the shade. It prefers moist soil.

Distribution

South-western N. America - California.

Habitats

Woodland Garden Canopy;

Edible Uses

Edible Parts: Oil Seed Edible Uses: Oil Seed - raw, cooked or used in pies, cakes, biscuits, confections etc[183]. A sweet flavour[229]. The seed is small with a thick shell but it makes good eating and is said to have a better flavour than Juglans nigra[183]. The seed is up to 15mm in diameter[229]. The seed ripens in late autumn and, when stored in its shell in a cool place, will keep for at least 6 months[K]. An edible oil is obtained from the seed, it tends to go rancid quickly.

Medicinal Uses

Blood tonic An infusion of the leaves is used to treat thin blood[257].

Known Hazards

None known