Answer: You need to cut out all of the canes growing from the rootstock, these would originate from below the graft. First figure out which canes are from the desired rose, and which are from the root stock. Usually, the root stock growth is much thornier than the desired rose and often it is much more vigorous. If you aren't sure, dig (gently) down until you find the graft and can see where they start. In your area, the graft might be at ground level or up to five inches below the soil surface, depending on who planted the rose and their feelings on winter hardiness. From now on, remove any root stock growth as soon as it appears.
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