The only thing I grew at home (in a pot, because dogs) was chili, because it's more scarce in stores than stuff like onions. Some do fear that the store ones are all "GMO" secretly, or even manufactured from some petroleum products, like my stepmother, who once learned that things like milk powder, egg powder, and meat powder exists, but she thought they all weren't made of the real things, because she couldn't believe the Earth could feed this many people, and the rich hoard all the good stuff for themselves.