ornamental ornamental /ˌɔrnəˈmɛntəl/

adjective

1. Serving an esthetic rather than a useful purpose  ( cosmetic , ornamental , decorative )
   serving an esthetic rather than a useful purpose
    Cosmetic fenders on cars
   cosmetic fenders on cars
    The buildings were utilitarian rather than decorative
   the buildings were utilitarian rather than decorative
   

noun

1. Any plant grown for its beauty or ornamental value  ( ornamental )
   any plant grown for its beauty or ornamental value