We can sometimes see the reason why one tree will not take on another from differences in their rate of growth, in the hardness of their wood, in the period of the flow or nature of their sap, etc.;
Batzuetan ikusi ahal izaten dugu zuhaitz batek zergatik ez duen beste bat onartzen: dela hazkunde-abiaduran, zuraren gogortasunean, saparen jarialdian edo izaeran etab. aldeak dituztelako;