Good for you. I hope the rose bush was of the "dwarf" variety, otherwise you are going to have to keep a close eye on it. Don't over water, but don't allow it to dry out.......make sure you feed it at least every 7 days......keep spray on the leaves to avoid any blight........regular rose bushes do not do well in pots..........in my experience.......
Anyway, you may be an experienced gardener and know all of this, but I hate to see a rose bush, any rose bush needlessly sacrificed on the alter of the weekend weeder.