The cutting material have flower buds but no or few vegetative buds.
The cutting material was taken from too old plant parts.
The cuttings were not taken from the trees at the appropriate time.
The cuttings dried out before rooting was initiated or during the rooting process.
The hormonal level in the cutting was too low to trigger or promote root formation. Treatment with RSH not sufficient (too short treatment, too diluted or too old RSH).
The rooting medium is unsuited for the root formation.
The cuttings were rooted with the distal end in the rooting medium.
The cuttings were attacked by the fungi.
The rooting conditions were not appropriate, e.g. too wet (lack of aeration) or too dry, or temperature not appropriate during root formation.
The cuttings were kept too long in a concentrated RSH.