Plant? Do you already have the rose?
I am not familiar with the climate zones, but unless it gets very cold I would be inclined to go for now; root growth tends to take place overwinter.
Roses are pretty hardy. I would do as Oliver suggests as long as it's not freezing or expected to before the soil can settle round the roots. I imagine it will look really pretty alongside your other "herbs". ...... or maybe you just drive an older MB.
I would mix some granular fertiliser with soil and then fill the hole around the rose. Don't put fertiliser directly into the hole as it will burn the roots.
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