Everyday and Garden variety

Everyday adjective - Being of the type that is encountered in the normal course of events.

Garden variety is a synonym for everyday (North American) in common topic. In some cases you can use "Garden variety" instead an adjective "Everyday".

Everyday is a synonym for garden variety in normal topic. You can use "Everyday" instead an adjective phrase "Garden variety", if it concerns topics such as common, ordinary, regular, average.