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Article from Bean's Trees and Shrubs Hardy in the British Isles
'Hypericum cordifolium' from the website Trees and Shrubs Online (treesandshrubsonline.
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One of the finest hypericums, this is at present known only from central Nepal and one collection in the eastern part of the country. Growing on sunny slopes at warm temperate elevations (to about 6,000 ft), it is unlikely to be hardy, and at Kew is grown in the Temperate House.