Flower door hinges are designed in such a way that the leaves sit flush against each other. This is achieved by fitting one leaf inside the other. This is an advantage against butt hinges since flower door hinges do not need a mortise or a recess on the surface of the body they are attached to. These types of hinges are used in light load applications.
Flower door hinges are the main options for bathroom doors and main doors. It is very easy to fit as they can be fastened directly to the door frame and do not require more efforts.