Like many other Hmong people, Ms Thanyaporn Thanomworakul has been growing hemp near her home in the mountains for as long as she can remember. Its yarn clothes her family for important rituals marking every milestone, from birth to death.

Unlike her ancestors though, she is not allowed to keep any seed. The tall leafy cannabis sativa is lopped off before it flowers so as to comply with a Thai government policy to control a possible narcotic while still allowing the hill tribe to retain its tradition.