"Herbs can be used as magical components, ingredients for potions and magical brews of all sorts, confections of poisons and toxins that can be ingested, inhaled or smeared on objects of all sorts to obtain the desired effect. You can make tinctures, myrrh, oils, balms, ichors, and incense with what you find at your feet if you know how to look. And if you don't need it you can always sell it at the market."