Roots supply nutrients to rose canes and leaves and allow photosynthesis to happen so flowers will grow. It’s all about the flowers we love so much. Some roses tend to root and grow well on their native roots, but there are others that will not grow vigorously and produce great blooms on their own roots. Budded or grafted roses have the benefit of having more feeder roots than own root roses. Your minimum winter temperature is an important factor in your consideration of rootstock. There are lots of pros and cons for the choice of a rootstock of roses and winter hardiness. That is not an issue in my new garden, but I do appreciate the larger root mass of budded or grafted roses.
I spent all morning potting up my recent order of maiden rose plants from my old Midwestern friend, Steve Singer of Wisconsin Roses.
Steve gave a hands on rose budding class several years ago at an ARS district convention. I tried it. I think budding roses takes a lot of fine motor skill that I do not have!