The meaning of a yellow rose signifies strong feelings of pure joy, gladness, happiness and platonic friendship, in Germanic countries the meaning of a a yellow rose is different - they're used to convey jealousy.
Friendship is the main meaning of the yellow rose but it also signifies familiar love and domestic happiness. Yellow roses also symbolize fun and freedom.
Today, the yellow rose is used to embrace a new beginning, apologize or express sympathy, and to say, "remember me" , "I am sorry', or "I care." Yellow roses are appropriate for marking the beginning of a new life together or for starting all over again.
The Language of Flowers
The language of flowers, sometimes called floriography, was a Victorian-era method of communication. Floriograpghy, in which various flowers and floral arrangements were used to send coded messages, allowed individuals to express feelings which otherwise could not be spoken. The meaning of the color of flowers was most commonly communicated through Tussie-Mussies (floral arrangements), a creative art form which continues today.
Though most popular in the Victorian period, the symbolic use of flowers dates back to antiquity. In Medieval and Renaissance culture flowers were often given moral meanings. This is most apparent in art in which saints are often depicted with flowers, symbolic of their virtues. Liana DeGirolami Cheney notes that "some of the Christian symbols for Virginity or Chastity are the white rose, the myrtle, a vessel or vase, the lily, and the unicorn"