My arms started growing (as proven by pics!) when I cut the volume to like 4-6 direct sets on them per week.
Heavy rows and shit apart from that. And of course heavy presses.
I got inspired by a friend, he never works out his arms directly, ever.
He's got quite the arms if you ask me, lol.
Generally I would say I look best on low volume, everything starts growing. Workouts are short and very light but that's when everything starts growing.