What is a good strong-smelling, hardy flower that I can grow inside to use as natural air freshener?

Melissa J asked: I’m going green and all-natural! I like strong floral scents and like to keep my house smelling fresh and sweet. I like floral and woody scents. (like pine and juniper and cedar). Im fond of eucalyptus as well. I’d like to know what is a good one to grow indoors that requires [...]