The threat of ash dieback ( Hymenoscyphus fraxineus ), which is decimating European ash ( Fraxinus excelsior ) populations, has heightened the need for a cheap and simple method to propagate potentially tolerant trees. We tested the effects of mother plant age, mycorrhiza, rooting hormone, timing and substrate type on the rooting of ash cuttings in order to optimise current propagation techniques. Semi-hardwood and hardwood cu...