Answer: The knot or the graft may rot if left covered with soil, but more importantly, the rootstock may send up shoots from below the graft and these vigorous shoots could overtake the grafted part of the rose bush without you suspecting a thing. The best approach is to wait until growth stops this autumn or winter and then dig up the rose and replant it at the correct soil level. It won't hurt your rose to dig it up while it is resting - if you dig it up now, in mid-summer, it may be stressed enough to stop blooming. Best wishes with your landscape!
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