> One nearby farm that I buy it from, it tastes like hazelnut. At another farm it tastes like sunflower seed.

I find that to be the case with a lot of product that are low quantity, locally produced.

Almost anything you buy at a supermarket is homogenized to make sure that when you buy Brand A at Store X tastes the same as Brand A at Store Y.

And even if it's the same company, the flavor should differ year by year, because it's based on a natural product. The harvests are different.