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Juglans major Cultivation | Propagation | General Uses 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 fast-growing when young[227]. This species is closely related to and sometimes considered to be no more than a sub-species of J. microcarpa[11, 229]. It hybridizes with that species where their ranges overlap[229]. If it is a distinct species then perhaps its correct name should be J. torreyi[11]. Trees produce good crops of seeds every 2 - 3 years in the wild[227]. Natural regeneration is very low because most seeds are consumed by wildlife[229]. Plants are fairly long-lived (to about 400 years) and produce a deep taproot, they are intolerant of root disturbance[1, 11, 229]. Seedlings should be planted out into their permanent positions as soon as possible and given some protection for their first winter or two 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]. For further Juglans major gardening information |
