Practical Plants is currently lacking information on propagation instructions of Juglans californica. Help us fill in the blanks! Edit this page to add your knowledge.
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Problems, pests & diseases
Associations & Interactions
There are no interactions listed for Juglans californica. Do you know of an interaction that should be listed here? to add it.
Polycultures & Guilds
There are no polycultures listed which include Juglans californica.
This table shows all the data stored for this plant.
Requires a deep well-drained loam and a sunny position sheltered from strong winds. Prefers a slightly alkaline soil. Plants are not very hardy in Britain, tolerating temperatures down to between -5 and -10°c. A fairly fast-growing tree in its native habitat, but quite short-lived, dying after about 125 - 150 years. Plants produce a deep taproot and they are intolerant of root disturbance. Seedlings should be planted out into their permanent positions as soon as possible and given some protection since they are somewhat tender when young. Flower initiation depends upon suitable conditions in the previous summer. The flowers and young growths can be destroyed by even short periods down to -2°c, but fortunately plants are usually late coming into leaf. Any pruning should only be carried out in late summer to early autumn or when the plant is fully dormant otherwise wounds will bleed profusely and this will severely weaken the tree. Trees have a dense canopy which tends to reduce plant growth below them. We have no specific information for this species, but the roots of several members of this genus produce substances that are toxic to many plant species, especially apples (Malus species), members of the Ericaceae, Potentilla spp and the white pines (certain Pinus spp.). The leaves of many species also secrete substances that have an inhibitory affect on plants growing underneath them. All in all this is not a very good companion plant[K]. Closely related to J. hindsii
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.
South-western N. America - California.
Seed - raw, cooked or used in pies, confections etc. A sweet flavour. The seed is small with a thick shell but it makes good eating. The seed is up to 15mm in diameter. An edible oil is obtained from the seed, it tends to go rancid quickly.
Often used as a rootstock for J. regia. Plants produce chemicals which can inhibit the growth of other plants. These chemicals are dissolved out of the leaves when it rains and are washed down to the ground below, reducing the growth of plants under the tree. The roots of many members of this genus produce substances that are toxic to many plant species, especially apples (Malus species), members of the Ericaceae, Potentilla spp and the white pines (certain Pinus spp.). Wood - moderately coarse-grained. An attractive wood, but the frequent branching pattern of the trunk limits the use of this wood commercially
An infusion of the leaves is used to treat thin blood.
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