This factsheet aims to highlight the interannual variation of the pine cone dimensions and present some factors that explain it, in order to contribute for the future establishment of silvicultural measures than can lead to a decrease in that variation, by promoting the conditions for bigger pine cones or selecting more suitable Forest Reproduction Materials (FRM) .
The environmental factors that play a role in the fructification of black truffle are well known. In particular, low water availability during summer period
