Redwood Database

An index of all Redwood cultivars both in and out of commercial production.

Sequoiadendron giganteum ‘Nanum’

Giant Redwood

Synonyms / alternative names
Sequoiadendron giganteum ‘Kalmthout’

‘Nanum’ is a slow-growing, compact cultivar of Sequoiadendron that exhibits an upright growth habit. According to Auders & Spicer (2012), this cultivar typically reaches a height of 3 m and a width of 1.5 m over a period of ten years, making it a relatively small selection compared to the species’ natural growth rate and size.

The origins of ‘Nanum’ can be traced back to 1907, when it was first recorded by Zederbauer. This early documentation suggests that ‘Nanum’ is one of the older known cultivars of Sequoiadendron, having been recognized and propagated for over a century.

Interestingly, a specimen of ‘Nanum’ growing at Arboretum Trompenburg in the Netherlands is believed to have been the source material for a cultivar that was renamed ‘Kalmthout’ around the year 2000 (Dendrologie Online 2006; Auders & Spicer 2012). This renaming highlights the potential for confusion and duplication in the naming of cultivars, particularly when they are propagated and distributed across different regions and time periods.

The compact size and slow growth rate of ‘Nanum’ make it an attractive option for gardeners and landscapers who desire the distinctive character of Sequoiadendron but may not have the space to accommodate a full-sized tree. Its upright habit also lends itself well to use in formal gardens or as a focal point in smaller landscapes.

As one of the older known cultivars of Sequoiadendron, ‘Nanum’ serves as a reminder of the long-standing interest in selecting and propagating unique forms of this iconic species. Its enduring presence in cultivation is a testament to its desirable qualities and the efforts of horticulturists to preserve and promote notable cultivars over time.

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