"A weed is no more than a flower in disguise,
Which is seen through at once, if love give a man eyes."
I think this speaks also to the way many heroes in romances are written. Initially most of them don't recognize the value of the heroine. She's mousy, she's trouble, she's got a temper on her... She's the "weed."
But, once that initial perception has passed (and of course, usually it seems that the heroine's "issues" are what throw her inadvertently into the hero's path) the hero's eyes are opened and he has feelings for her (which often he fights).
So here's the question--Does your tale's hero or heroine need their eyes opened to recognize the "flower" before him/her? What sort of event might bring about a heroic epiphany?