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Juglans californica California walnut Deciduous tree (1 Page of 5) The Juglans californica plant species is found in Southwestern N. America - California. It is a member of the Juglandaceae family. Common gardeners may know the plant as California walnut. Cultivation | Propagation | General Uses Medicinal | Edible Uses Latin Name: Juglans californica Common Name: California walnut Family: Juglandaceae Author: S.Wats. Known Hazards: None known Mature Height: Mature Width: Habitat: Moist or dry gravelly soils along river courses and bottomlands[229]. Locally common in oak woods below 750 metres[71].
Cultivation Notes: Requires a deep well-drained loam and a sunny position sheltered from strong winds[1, 11]. Prefers a slightly alkaline soil[200].
Plants are not very hardy in Britain, tolerating temperatures down to between -5 and -10°c[200].
A fairly fast-growing tree in its native habitat, but quite short-lived, dying after about 125 - 150 years[229].
Plants produce a deep taproot and they are intolerant of root disturbance[1, 11]. Seedlings should be planted out into their permanent positions as soon as possible and given some protection since they are somewhat tender when young[1, 11].
Flower initiation depends upon suitable conditions in the previous summer[200]. 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[200].
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[200].
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.)[200]. 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[183, 200]
For further Juglans californica gardening information click on one of the blue links below Cultivation | Propagation | General Uses Medicinal | Edible Uses
The information above has been supplied solely via the hard work and dedication of the team at 'Plants for a Future'. View their bibliography

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