I have tried blackberry cuttings several times and have not had any success with them. I can easily propagate with root cuttings, harvesting the suckers, tip and serpentine layering but cane cuttings has proven difficult. Note, I have not tried using the rooting hormone for the cuttings so maybe that is why but research says you can do it without the rooting hormone. I recently did an experiment on stem cuttings trying both primocanes and floricanes along with scratching and no scratching to promote rooting. Neither worked. It’s difficult to keep the right moisture levels. I’ve also tried using a lot of moisture and less moisture along with keeping the cuttings inside and outside in the shade. Still no growth. I don’t want to use a rooting hormone so I’ll stick with root cuttings, harvesting the suckers, tip and serpentine layering which I find the easiest. Check out my experiment below.