Plant parsley INDOORS, It will act like a perennial.

I have even had to take some to the local green houses as they did not believe it was acting like a perennial. The last I grew was at least 10 years old and the stalk was over an inch thick, finally got to top heavy and broke over. Fresh parsley with a clip of the scissors. I watered with the water from a dehumidifier, and a tiny bit of fertilizer added to a gallon jug. I usually have 3 pots going.