Grafting

I don't consider myself a good gardener, just someone who likes plants. I have had a go at grafting some roses and too date have about 11 successes.
I have one with the two Iceburgs - Burgendy and White as well as the yellow Freesia on the one plant. My latest effort is New Era - the graft is just starting to grow. I put 3 buds on but only one was successful.