|The first summer after I planted my rose bush, the blooms were red. The second year, however, the rose blooms were white. What caused the change?
|Most roses are grafted, with the desired variety on top (the scion) grafted to a hardy rootstock. The most likely explanation for the color change you saw is that the scion did not survive the winter. The next year the rootstock sprouted and bloomed instead, and its flowers were white.