Muguet. The lovely French tradition of giving a '' brin de muguet'' on May 1st dates back to 1561 when King Charles IX offered all the ladies of the court a bouquet of Lilies of the Valley. It's supposed to bring happiness and health until the following year. In the language of flowers, lily means “return of happiness ”. I love this custom, so I wish you every happiness for all, with this little bouquet of Lily of the Valley!