Of course. Herbalists should know how to make their own medicine in general, not just work with plants to make scents and whatnot.

[setting his crutch aside, nehan starts to check the cupboards underneath the shelves for other herbs that haven't been stuffed into jars and left out for display. none of those on the shelves can be used now, who knows what they were exposed to.]

Pharmacy comes hand in hand with herbal medicine.