I'm wanting to move part of my deceased grandmothers rose bush to my flower garden, but still leave most of my grandmother's at her house in her garden. How would I do that?
Roses don't survive division. Your best bet is to start a new plant with cuttings. Here is a detailed explanation of how to do this. https://aggie-horticulture.tamu.edu/southerngarden/roseprop.html