I realize they are cute and cuddly, but they can really be destructive.
We have a Raspberry patch (about 50 foot square).
Porcupines, like beavers, have tis compulsion to chew in the spring. A porcupine will stand on his hind legs and gnaw off a stalk. They then move to the next, and kill it.
In a night a porcupine can chew off 20 or 30 stalks. A family of porcupines have destroyed my patch a couple times.
A healthy stalk will produce between 3 and 4 pints during the season. We sell them for 5 dollars a pint.
It adds up quick.
A .22 with low velocity loads solves a lot of problems with very little noise.