I've been to Zheduo Shan were the Kevock-seeds were collected, it's cool and moist with Rhododendron brush and peaty soil over slate. Primula tangutica has a similar distribution and habitat, and that one is easy in the garden in acidic soil in a bright woodland setting. They have a tendency to rot off during winter when they get big, so divide it every other year or raise new ones from seed.