Can I keep herbs fresh by spraying them with fertilizer? I tend to use a lot of fresh herbs for cooking so over time with trial and error I have come up with this:

It is possible to keep herbs fresh (Parsley and Dill mostly) for around a week or more but putting them on an EMPTY jar (without water) and spraying water on them, then a plastic bag would loosely cover it. Since I use herbs bit by bit every day so I re-spray water on them every other day or so.
The herbs are almost entirely green and crispy, with virtually no difference from fresh.

If I mixed water with fertilizer and sprayed it on the plants would they keep alive indefinitely or long time?  

EDIT: I know that once a vegetable is picked it will start metabolizing its own nutrients at certain rate before it goes bad.

Now if I place herbs' stem ends in a pot with soil (well-fertilized), will it stop it from metabolizing itself? Since it can get nutrients from soil?
Dousing your herbs with fertilizer is not going to preserve your herbs, and could make you sick as many fertilizers are toxic. 

If you want really fresh herbs you can keep them in pots on a windowsill, otherwise your spraying water method is about as good as you are likely to get.