A 50% success rate for cuttings is pretty good (not sure about roses specifically). If they're not doing anything they may never do anything - best to take more cuttings and if you have the space, let the old ones sit another few months and see what happens
I took a few rose cuttings ages ago. Two made it and have started to sprout(sp?), one even has a flower. They were both in the same pot.
I was going to gift one, so repotted them. Neither had any roots. They just had nodule type things a bit like in this pic I found online.
However, the soil in the pot has a lot of perlite so Idk if some of that could have just got stuck. Shudda taken a pic at the time.
Two questions:
New better pic now attached.
Any other thoughts or tips appreciated.