I think it takes a while to get Pecans from a Pecan tree. You can get good production from the trees I mentioned in 3 years. Had someone not helped themselves to my 4yo Orange trees oranges I’d had enough to last all winter.
I like the winter garden best, the heat in the summer here wilts just about everything except okra.
We have hundreds of mature Pecan trees planted years ago. Several years ago we had such a Pecan crop we had to hire a company to harvest them for us. The reason for the new ones planted 3 years ago were the Truffles. That was just an experiment., no answers yet.