I grow mine in our aquaponics and it really likes it all year round and that also gives me the ability to move the media aside and prune the roots so it doesn't over take the growbed.
I just love Choc Mint, for me living in Toowoomba, I need to put in greenhouse during colder months so as not to kill the poor thing. This mint we use in multiple things, its great in drinks, desserts, execellent in fruit salad gives and dried for baking, give it a go