6 years ago I planted 2 yellow climbing roses about 5-6 feet apart. They did great-grew full and with large beautiful blooms. Last year one of the climbers sprouted sub-standard RED roses. The other one is still sprouting the yellow blooms. Why would the color change on the one bush?
Most rose bushes are hybrids which can have many grafts from other plants. I have roses with 4 different colors. It makes a beautiful bouquet!