Self seeded rosa rugosa

I believe my rosa rugosa has self-seeded. Or is it possible to have a runner? I've got what appears to be a new shoot about a foot away from my existing rosa rugosa.
My question is - how long should I wait before I move it somewhere else? Right now, it's about 8" tall. I can't leave it where it is for very long, since it is in between two rose bushes.
Thoughts?
Irene
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Both are possible , but runners/suckers are much more common.
I've got what appears to be a new shoot about a foot away from

That sounds like a runner/sucker. R rugosa are not usually grafted, so the root sucker will match the parent.

Rugosa leaves are already in growth so moving is a bit late for this season, autumn would be better. However, what most people do with rugosa each year is to prune out some of the oldest stems right to the ground, leaving the suckers as replacements.
Janet
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