The Daraz do have a writing system, but because of their infrared vision, it's not straightforward for them to jot down a list. If they need to remember a sequence (like, for instance, a list of ingredients), they improvise a song instead. The rhythm and melody aid with recall.

Meadowsweet, silverweed, and tormentil are all real plants with various medicinal properties (antiseptic, fever-reducer, wound treatment, etc.).