If you receive 11 red roses and one white rose, the white rose conveys devotion, and the red roses mean true love. This combination is sometimes given by a man who wants to ask for a woman's hand in marriage.
According to Telaflora, red roses symbolize love, respect and enduring passion. The white rose is a symbol of purity, innocence, humility and respect. The combination of red roses and white roses can also be used to convey a message of deep love and respect for the recipient's purity. Equally as important as the colors in this arrangement are the numbers.