Despite his terrible childhood experiences, all Harry ever wanted was to do good for others. In return, he was given incredible power over their hearts. Voldemort was obeyed out of fear. The Ministry was obeyed out of ignorance. A good master is obeyed out of trust and love. Abused, wise-beyond-years Harry.

There were many ways in which Harry expressed his love to Hermione over the years, and they often involved a flower. His love was simple - protect, comfort, sacrifice - but it was more than enough for her.