Can be found in mostly sub-urban and rural areas.
Area of expertise is varied, but is usually related to their own "zone".
Friend: Uh... yeah, nice.... (huh?)
Gardenologist: Hey! What's that weird looking plant by your foot?
Friend: I dunno, you're the gardenologist!
Gardenologist: Oh,how sweet, there's a name for people like me!( proceeds to pluck a leaf of unknown plant to identify later)