text: I once did a project calling extracting essential oil.  You can take a look at that too.  There are many ways to do it.  However, you need quite a lot of roses in order to extract just a small amount.  It's a fun project because you will be able to smell the fragrance later but it's time consuming.  \n\nAnother idea is to look up their genetic information.  I think it would be cool as well :-)