Belfast Botanic Gardens Tree Archive

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This is one of a series of short articles about trees in the Belfast Botanic Gardens compiled by the Friends group. The tree tag number relates to the black tree maintenance tags, usually fixed on the tree trunk, 2 to 3m above ground level.
Family: Juglandaceae
Juglans regia L. 'Purpurea'
Purple leaved walnut

(no tag)
54o 34.935N
5o 56.060W

This is a very rare purple form of the common walnut (Juglans regia). It is not even mentioned in many tree books and the Belfast Botanic Gardens specimen is one of the few illustrations of this plant in Google Images. It is slow growing but should eventually make a handsome small tree of about 10m (some nurseries give a figure of 4m for height while other sources suggest they can reach 20m). The leaves are blotched with red and the husks of the nuts are a deep red. The large buds, in common with the species, are a buff colour making them easy to distinguish from ash (Fraxinus sp) which has black buds. The aromatic leaves secrete a toxin which can kill herbaceous plants planted under walnut trees

Purple walnut in Belfast Botanic Gardens

leaves of purple walnut

Young tree of purple walnut in Belfast Botanic Gardens Foliage of purple walnut

stem and buds of purple walnut

fruit of purple walnut

Purple stem and buff-colour buds of purple walnut Purple nut husks of purple walnut, Belfast Botanic Gardens

Photos taken in Belfast Botanic Gardens in 2009. Copyright: Friends of Belfast Botanic Gardens.

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