Is it true that Princess Diana's symbol is the rose?

Princess Diana is the true symbol of kind, tender, rare and beauty, and a heartthrob for millions.

Yes, since her death, the rose has come to symbolize Diana. Elton John sang "Goodbye England's Rose" during her memorial service and since then it has been associated with her. The connection was further strengthened with the development of a hybrid rose called the Diana Princess Of Wales Hybrid Tea Rose.