In Victorian times, certain flowers had specific meanings because the flower selection was limited and people used more symbols and gestures to communicate than words. But today, with so many flower choices, there are no rules - it's the sentiment that gives the gift its meaning. Many people assign their own personal meanings - a flower or color that might remind them of a special event or moment in their lives.
For those interested in the historic meanings of flowers, here is a list we've collected from various sources:
Gardening Home 
Flower Meanings 
“I like to think a flower opens itself to outgrow its ‘plantedness’. That it yearns to be ‘carried away’.” 
