The country has a strong link with the British horticultural, landscaping and parks community, he explained. Many of our garden plants originated there, from Primula denticulata to Daphne bholua and Cedrus deodara.
"Often it was trained, skilful and dedicated local 'staff' who actually collected the seed from which many garden gems have been raised, when the famous names were safely back in the UK," Chadwell explained.
He told HW he and other plant hunters owe "a massive debt" to the porters, guides and assistants from countries such as Nepal.
Chadwell has led 29 plant-hunting expeditions to the Himalayas and his own main assistant, Til Jung Rai, suffered minor injuries in April's quake. He and his wife now live outdoors because their rented rooms are unsafe.
Chadwell has lectured to gardening societies for more than 30 years. He is offering to waive his usual speaking fee for it to be donated to a relief fund and is calling on gardeners to donate to The Britain-Nepal Medical Trust.
"Given the scale of what happened, Nepal will genuinely need support for many years to come," he said. For details, email email@example.com.