These are cuttings of that have been rooted from an elderberry plant in the yard. They are very easy to root. But you have to get the woody part of the stem. The green part won't root.
Another easy to root plant is goji berry. The green stems of the goji's will root. The leaves won't even drop off. They just go.
Another method of rooting tree cuttings is to wrap the cuttings in a wet paper towel and place them in a container. This method has been more of a success for the stone fruit cuttings for me. I learned this method here.
In the bottom I put in some perlite to give the cuttings some support.