A bouquet of roses in full bloom

Gratitude

A single rose in full bloom

"I love you" or "I still love you"

Deep pink

Thank you

Light pink

Admiration and sympathy

Pink

Gentle and graceful

Red

Love, respect, courage

Red and white together

Unity or an engagement

White

Four different meanings  
Innocence and purity
" I am worthy of you"
"You´re heavenly" 
Secrecy and silence.

Withered white roses

Fleeting beauty or "you made no impression"

Yellow

Joy gladness or "try to care more"