How can extend the life of parsley and other culinary herbs?

If they are fresh, you can always freeze them. Just make sure that when you do, you spread them out evenly, once they are chopped, on a baking sheet. Put in the freezer for about 30 minutes. Once frozen you can put them in a ziploc bag or any airtight container and place back in the freezer. Remove herbs desired as needed. By freezing them on the baking sheet, you prevent water from crystalizing between the herbs.