Here's what the blossoms look like:
You can spot it as anything from a 2-3ft ornamental shrub to a tree that is 2 meters tall. 200 years ago, it was one of the most common European ornamentals. But on this side of the world, it requires more trimming than most people want to do - in order to keep it a manageable size.
Most of the commercial Lemon Verbena is grown in France, but it is found natively in Peru and Ethiopia. You'll find it growing best where there isn't winter frost, and summer temperatures do not exceed 100 degrees (USDA zones 8-10 are best). Seeds are difficult to purchase, so most people start their own plants with softwood cuttings.
Image taken from:
http://rustylopez.typepad.com/imagoarticulus/2005/11/index.html
These websites were helpful with information:
http://www.uni-graz.at/~katzer/engl/Lipp_cit.html
http://davesgarden.com/pf/go/279/
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