To take cuttings from hydrangeas, you first take a cutting from a branch that has not flowered. Secondly, remove the leaves below the bottom two leaf nodes. Thirdly, cut largest leaves to about half their size. Lastly, dip the cuttings rooting and insert it into damp vermiculite and other sterile medium. Ensure that you water the pot well, allow it to drain and keep the soil moist.