Blueberries cuttings are some of the hardest to propagate, but not impossible. I have had great success with propagating late summer green wood/shoot cuttings under a misting system every 5-10mins for 5 seconds! Dormant rooting is another story…I would get about 30 percent that would take. This video should increase your chances with dormant/early spring cuttings. The trick is to maintain the temperature at 60-80f for weeks on end for a few months. BLUEBERRIES IN CONTAINERS EPISODE 9: Rooting N Propagating Dormant Blueberry Cuttings Successfully! - YouTube