I had a thought today. I know herbalism has been brought up before but how about putting it into application. As in if you don't have it a plant may be visible and actually have an eat option. Maybe you get lucky and its harmless and maybe you get unlucky and its poison or makes you sick. How about the concept we don't instantly know what something does or all its uses simply by collecting it?
This opens up new areas for other skills as well. Poisons are a popular request and by learning which plants do what could be helpful. Just as learning some plants are medicinals. We start getting in to apothecary work and such.
Putting herbalism into practice also should apply to crops. I always enjoyed the concept one skill should be applicable to another to augment or boost it. Maybe herbalism allow better food preservation or opens new recipes.
Let's apply our skills a bit more I guess is my suggestion.