Thanks for the great guide! I learned a lot!
It doesn't mention the unique effect of each herb being dependent upon who gathered them (correct me if that isn't right).
You might add that you need a mortar and Pestle to mix herbs, however I had them in a bark box with my herbs and mixed right from the bark box, so apparently you don't need it in your inventory, just "open" (please confirm).
Starting our community, while I worked on smelting, someone else gathered herbs for me, and I experimented with them, finding 2 x Raises intellect, 1 Strength, 1 Restore HStam, 1 Lowers Max Stamina, 1 Damages Stamina/Regeneration, and 1 Poison.
When I read about herbs being unique per person, I made a new bark box and put herbs in it that I'd gathered myself. I then started making combinations of them, and in approx. 5 hours of systematic mixing (herb 1 with herb 2, herb 1 with herb 3, etc), I found NO new combinations of the 4,290 possible 2 herb combinations, and am stuck at herbalism = 34.
Also, MY herbs, seem to produce the same results herb by herb, as those gathered by someone else and given to me. Perhaps the rule is just that herbs are unique to the PREPARING individual.
Somewhat unrelated, but it happened to me re: Herbalism: today I can't open my herb box nor the herbalist house! It turned out our guild leader wasn't doing sacrifices correctly, so the monument representing our guild would go away after 2 days, resulting in our losing access to such things! I'm back in after she recreated the monument and invited me back in.