From a google search. I did not know these off the top of my head.
Red: Love, beauty, courage and respect
White: Purity and innocence, silence or secrecy, also reverence and humility
Pink: Appreciation,"Thank you", grace, perfect happinesss, and admiration
Dark Pink: Appreciation, gratitude
Light Pink: Admiration, sympathy
Yellow: Joy, gladness, friendship, delight, the promise of a new beginning
Orange: Desire, and enthusiasm
Red and White: Given together, these signify unity.
Red Rosebud: A symbol of purity and loveliness
White Rosebud: Symbolic of girlhood
Thornless Rose: Signifies "Love at first sight".
ZV
EDIT: Forgot that multiple spaces don't get shown in posts. Trying for some clarity.