Not sure if anyone has said this yet, but since you mentioned your character tends to lean towards more natural remedies, you could always do research on real-life holistic practice, and get a feel for what sort of healing properties different herbs and flowers have. Might give you a way to inject a little bit of 'educated realism' in your RP :] And of course since Eorzea has it's own flavor of flora, you could always make stuff up too. I've never seen anyone have an issue with it.
