Everyone seems to have their way of growing fiddles,
@adsin. In all my years of growing hundreds of them, 25+ years, I have never pruned roots. I have a "momma" fiddle that is over 25 years old and she's never had her roots pruned. Before she went into the ground this fall, she was in the same pot for over 10 years. Was she root-bound? Absolutely. Did it bother her? Not at all. I simply had to water her more frequently. She grew approximately 2', each and every year.