I am afraid to tell you that you have been partially deceived.
What usually happens here in Italy is that someone comes out (it is at least 30-40 years that this thing comes up regularly) with a new, better method to "insert" truffle spores in tree saplings and is wishing to sell you (for a dear price) these trees.
Only, for some reasons in your particular patch of land (which is regularly "approved" after having made - BTW expensive - surveys and laboratory checks/analysis on the soil) this doesn't happen (after 5 years, and they tell you that is too early) then nothing happens after ten or fifteen years and by that time you can't find the seller anymore or even if you can they will tell you that yours is one of the rare cases where it didn't work.
Anecdata of course and I sincerely hope that some other people had more success, but from my experience in the local agricultural district I know rather well, people that report success are maybe 5% (and likely they are IMHO lying).
Besides - at least here - land is usually raided by wild boars that - like pigs - are very capable at finding truffles.
Wow! So you're saying this guy I met has a real truffle business now, but might have had to go through this con you speak of? And then shared this information with us and I think it's legit?
Or maybe he was the exception and not the rule, and by a lucky connection of Venus with Saturn had the "right" patch of land, with the "right" soil and the "right" set of "injected tree sprouts" or whatever.
I don't doubt that it can work, what I am telling you is that AFAIK it is not a "surely working" approach, if you have some land and some spare thousands Euro to invest in an experiment, it is fine, if you think that those thousands Euro will surely grow to a few tens in fifteen years, you are most probably wrong.
What usually happens here in Italy is that someone comes out (it is at least 30-40 years that this thing comes up regularly) with a new, better method to "insert" truffle spores in tree saplings and is wishing to sell you (for a dear price) these trees.
Only, for some reasons in your particular patch of land (which is regularly "approved" after having made - BTW expensive - surveys and laboratory checks/analysis on the soil) this doesn't happen (after 5 years, and they tell you that is too early) then nothing happens after ten or fifteen years and by that time you can't find the seller anymore or even if you can they will tell you that yours is one of the rare cases where it didn't work.
Anecdata of course and I sincerely hope that some other people had more success, but from my experience in the local agricultural district I know rather well, people that report success are maybe 5% (and likely they are IMHO lying).
Besides - at least here - land is usually raided by wild boars that - like pigs - are very capable at finding truffles.