How do you propagate roses from old wood?
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This article may help. https://www.gardenersworld.com/how-to/grow-plants/how-to-take-rose-cuttings/
Putting your cutting in to a potato is meant to work well!
https://homeguides.sfgate.com/propagate-roses-using-potatoes-23904.html
Either air layer the wood before cutting from the plant or dip the cuttings in Root Tone before potting the cuttings.... https://www.youtube.com/watch?v=8854Jdpioko