The idea is simple, as of now whenever your "search for herbs" a number of different herbs appear around you and there are a few models depending on the quality of the herbs the game generated.
Why not make it so that when you use that ability you see the model corresponding to the plant you're going to gather?
This way beginning herbalists will still have to gather everything they see because they won't know what herbs do what, but more seasoned gatherers will remember what an herb looks like and - if they're looking for a specific one (because they know what effects that herb has) - just take what they need.
With this rather simple addition to the game gathering will become more like "mhm..I need this herb, let's go to the forest and find it" instead of "let's just gather every herb in the forest so I have a chance of finding what I need", meaning a more immersive and "realistic" experience.
I'm not much of a programmer, but as I have noticed plants are only shown clientside I don't think it should be a really big hit on performance either.