Answer: Wow, what an interesting chain of events! I think your rose bush will recover from its decapitation. You should see some new stems growing within 2-3 weeks. Whether or not it will recover enough to bloom again this summer is something we'll just have to wait and see. I have a winter home in Arizona where Jackson-Perkins grows acreas and acres of roses. One day I watched them come through the rows of blooming rose bushes and chop them all down to about 2' from the ground. I was heartsick, and amazed all at the same time. I didn't have to worry - those roses simply sent up brand new flowering shoots in a matter of weeks. So, what happened to your rose bush isn't all that unique.
I agree, 2' between shrubs isn't enough room but considering what your plant has been through over the past few weeks I think it would be better to allow it to grow this year and then dig it up and move it in late winter, while it is still dormant.
I'd space the roses at least 4' apart so they won't compete for sunlight, moisture or nutrients and so there will be good air circulation to prevent diseases.
Best wishes with your new rose bushes!
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