Why is Leung Cha Part of Hong Kong's Cultural Heritage?
According to the Convention, Intangible Cultural Heritage (ICH) refers to the practices, representations, expressions, knowledge, skills – as well as the instruments, objects, artefacts and cultural spaces associated therewith – that communities, groups and, in some cases, individuals recognise as part of their cultural heritage.
This ICH, transmitted from generation to generation, is constantly recreated by communities and groups in response to their environment, their interaction with nature and their history, and provides them with a sense of identity and continuity, thus promoting respect for cultural diversity and human creativity.

The Intangible Cultural Heritage Inventory of Hong Kong contains 507 items. Here's how they are distributed :

Herbal tea belongs to the domain “Knowledge and Practices Concerning Nature and the Universe” — one of the smallest but most meaningful categories. This domain covers traditional knowledge about the natural world, medicinal plants, and ways of maintaining harmony with our environment.