Flowers have a long history of being used to convey secret messages. In the Victorian era, certain flowers were given specific meanings and could be used to communicate a hidden message. For example, a red rose indicated passionate love, while a yellow rose signified friendship. Today, the secret meanings of flowers are still used to express emotion and sentiment in a more subtle way. Giving someone a bouquet of flowers with a secret meaning can be a powerful and meaningful way to say how you feel without having to come out and say it.