Herbal Books
There are three herbal guides that you can collect over the course of your progress. All three are obtained from Aleena Arlavin.
Herbal Remedies
The first book contains recipes for simple teas and juices.
Nature's Secrets
This book instructs intermediate herbalists in making poultices, syrups and oils.
Gifts of Xiosia
The final book contains some last recipes for powders and salves.