For the hardwood cuttings of Blueberry,take them during late Winter or early Spring,before they start growing.Put them in a baggie of damp Peat moss,with an angled cut at the bottom end of each one.Make the pieces about 4-6 inches long.
Keep them in a refrigerator until it warms up to about 60F outside and then stick them about 2-3 inches in a mix of damp Peat and Perlite,preferably in a container with a cover,like a dome.Give them filtered light,so they don’t get too hot,especially if covered and start misting the leaves when they begin to grow.Keeping the leaves wet until roots are growing,is likely,the most important part.Brady
PS Oregon State U. found no benefit using a root hormone with Blueberry cuttings.