Embedded properties are handled in a special way by the f:field and f:all tags. If the property attribute you pass to f:field is an embedded property then the tag recursively renders each individual property of the embedded class with a surrounding fieldset. For example if you have a Person class with a name property and an Address embedded class with street, city and country properties <f:field bean="person" property="address"> will effectively do this:

You can customize how embedded properties are surrounded by providing a layout at grails-app/views/layouts/_fields/embedded.gsp which will override the default layout provided by the plugin.

When you use the f:all tag it will automatically handle embedded properties in this way.