Mary Travers -- symbol of flower generation?

This isn't very writerly, but I really wanted to write about it.

I was very saddened today by loss of folk singer Mary Travers from Peter, Paul and Mary.
I don't know the origin of the flower/peace vs war symbolism (and for once I'm not going to research it), but I always associate it with Mary because of her quintessential song "Where have all the flowers gone?".
Her songs were so simple, yet they had the power to influence so many people and move them to action. Not just Peter, Paul and Mary, of course, but Bob Dylan ("Blowing in the Wind", which Mary sang as well), Pete Seeger, Joan Baez and others who were the voices of their generation.

Though to judge by the clip below, Mary Travers looks like she would fit in a glossy magazine today, retro style (Just ignore the guys).

Flower power to you, Mary Travers. May you rest in peace.