This was in one of my emails from Lowes Food. Thought it was very interesting, especially if you like to buy organic:
Remember, “locally-grown” doesn’t necessarily mean “organic.” To be labeled organic, foods sold in the U.S. must meet certain production standards. So the next time you pick up a piece of produce, take a closer look at the “Price Look Up Code” or PLU sticker. Stickers with 4 digits that begin with a "3″ or "4″ mean the produce was conventionally grown with chemical fertilizers, herbicides or fungicides. A 5-digit code that starts with "8″ means the produce was genetically engineered, and one that starts with "9″ tells you that the produce was raised organically. Do Your Part and be aware of how your produce was grown and where it comes from because everyday green living is good for you.
You can look up PLU codes at http://www.fruitsticker.com, and to find a local farm near you, check out http://www.localharvest.org.