Tree Hugger - PLU (or Price Look Up) codes are the 4- or 5-digit numbers on produce stickers that have been used by supermarkets since 1990. They represent a globally standardized system implemented by the International Federation for Produce Standards, a group of national produce associations from around the globe...
The system is based on 4-digit codes that are within the 3000 and 4000 series. The numbers are assigned randomly, that is, each digit does not imply anything specifically, just an overall identification number. As an example, a small Fuji apple has the code of 4129, a large Fuji apple has the code 4132.
If the 4-digit number is preceded by a 9, it indicates that it was grown organically. 94416 in the photo above? An organic large Anjou pear; a conventionally grown large Anjou pear would be 4416. So any 5-digit number that starts with a 9 identifies the produce as organic
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