Rooting sentimental rose

Hi everyone, I am a very amateur gardener. Our parents home was sold this year and my sister dug out a rose bush our late dad planted 30 years ago, it broke into 2 pieces so luckily we both have a piece of his rose- our other siblings would love to have this rose too so I have attempted cuttings and- I am almost afraid to get excited but- I have a piece that is rooting- I took the cutting in july and used rooting hormone- I repotted it just out of curiosity to see if it had rooted and it had.
It is in my greenhouse, I am keeping it moist, not too damp- it is sitting on a raised bed- sheltered from the wind - today I noticed brown spots on the stem - I fear I may have damaged it by repotting it- is there anyting else I could do to give this cutting a helping hand? should I fertilize it? (I haven't) my brother suggested feeding it with chicken pellets or tomato feed but he is not an experienced gardener either-
Any help would be appreciated as this rose is of huge sentimental value to us all.
Thanks in advance
Marie
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Hi Marie. It is not advisable to add fertiliser to cutiings. Fertiliser is better for older, established plants. Is there any chance you could upload a picture of your cutting so that the damage can be seen? It has probably been set back by transplanting.
Hi, thank you for your swift reply, will try and get photo uploaded
What I would do if it were mine would be to cut just above the second bud from the bottom. Make the cut a slanting cut of about 45 degrees give or take. This allows water to run off the stem to avoid rotting. This little diagram will help you see what I mean
Thank you both for your advice, I have done as instructed, such a shame when it had rooted
All is not lost yet. Removing the dead bit gives it a fighting chance but leave it in the pot it is in now until next year. Protect the pot from severe frosts by tucking it close to a house wall or put it in an unheated greenhouse if you have one. Don't overwater it but don't let it dry out. I know it is special to you so I'm keeping my fingers crossed. Someone wanted that cutting to root.
Thanks again, will do as you say and hope for the best! Its going to be a long winter!