IT’s an old fashioned herb with a light lemon scent. Clearly lemon but not as sharp as actual lemons and just the tiniest bit floral.
I did have a small plant in the 80’s which I loved. But small apparently isn’t normal. THe wikipedia article says they can grow to be 2-3 meters (that’s 6-9 feet). It’s originally from South America.
The leaves are what carries the scent. The flowers are small and not showy.
If you want to smell something pretty close to the actual plant, find a L’Occitane shop. Their lemon verbena line is pretty true. I just wish they still made that scent in solid perfume.