What makes a pink rose bush bloom a nearly white rose?
Grafting would affect blooms on the same cane. First thought after seeing the condition of the white rose is thrips. These are insects that get inside the bud and suck the juices and weaken the flower…and perhaps to the point the pink didn’t form up. This looks like a mini rose??? You could also have spider mites…they just LOVE minis. They are “suckers” too, slurping all the plant’s strength. Thrips you can see (with good glasses) by tearing apart the bloom and watching for quick scattering little brown or green specks. Spider mites leave the leaves rather spotty and yellowed or grey. Thrips need a pesticide, mites can be washed off daily for 2-3 weeks to break apart the repo cycle. Another thought is a genetic mutation……..have to see if it happens again on the same cane. TFinally a virus……which we won’t even think about here. I am concerned on how you are pruning. Cut spent blossoms back to a 5 leaf cluster…just above the. Don’t leave long blind canes since they will not
