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Forestry and garden hybrids, with long straight stems in good conditions; intermediate in features between their parents and often sterile.
USDA Hardiness Zone 6
RHS Hardiness Rating H5
A prolific group of hybrids, mostly selected for forestry use and combining the hardiness and general adaptability of Paulownia tomentosa with the straighter stem and extra vigour of P. fortunei.
A clone available in the United States early in the 21st century (Hatch 2021–2022) from paulowniainternational.com (a company no longer trading under that address in 2022).
A hardy selection offered by the German company WeGrow GmbH (WeGrow GmbH 2022).
Scions of a tree planted at Arboretum Wespelaar in Belgium in 1991 were available by 2022 in the UK from the Place for Plants and Perryhill Nurseries Ltd. The parentage is not confirmed – this was presumably an open-pollinated seedling – and several French nurseries offer it as a clone of Paulownia tomentosa; the Royal Horticultural Society lists it as a cultivar of P. kawakamii (Royal Horticultural Society 2022), something which the flower structure seems to rule out. The original plant has made a shapely but two-trunked tree, elegant in foliage and bearing mauve flowers with a purple flush outside and small indigo spots and a creamy-yellow blaze in the throat (TreeLib 2022).
Synonyms / alternative names
A clone selected for its performance in Malaysian Borneo and marketed by Green-Gain (Pim 2021). Stems are harvestable after three to four years’ continuous growth in a tropical climate.
The clones ‘Shan Tong 3’ and ‘Shan Tong 4’ have been bred in China for rapid growth and drought- and frost-tolerance (Luca et al. 2014). In Europe they are marketed by Paulownia.BG, a Bulgarian company.