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Juglans cinerea Cultivation | Propagation | General Uses Cultivation Notes: Requires a deep well-drained loam and a position sheltered from strong winds[1, 11]. Prefers a slightly alkaline soil[200]. Prefers a sandy soil with a pH around 6 to 7[160]. Dislikes compacted soils or clay sub-soils, otherwise trees grow well on most soils[160]. This is the most cold-resistant of the walnuts[117], tolerating temperatures down to about -35°c in N. America when fully dormant[160]. It is less hardy in Britain, unfortunately, because the wood does not ripen so well here due to our cooler summers. The young growth in spring can be damaged by late frosts[200]. Sometimes cultivated in N. America for its edible seed, there are some named varieties[63, 117, 183]. Trees can come into bearing in 6 - 10 years from seed and fruiting is usually biennial[160]. The trees are quite short-lived, seldom exceeding 80 - 90 years[229]. They require about 105 frost-free days in order to ripen a crop in N. America[160]. Unfortunately, they have not proved successful as a nut tree in Britain, usually failing to produce a crop[11]. This is probably due to our cooler summers[11]. It is sometimes planted as a timber tree in Denmark and Rumania[50]. Plants produce a deep taproot and are intolerant of root disturbance. Seedlings should be planted out into their permanent positions as soon as possible and given some protection for their first few winters since they are somewhat tender when young[1, 11]. Trees cast a dense shade which reduces the amount of species able to grow below them[201]. 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]. Plants should only be pruned when they are fully dormant in winter or when they are in full leaf, otherwise any cuts will bleed profusely[200]. Hybridizes with J. ailantifolia, there are some named varieties of this hybrid that are grown for their edible seed[160]. For further Juglans cinerea gardening information |
