I would go deep. I had my first years in a 25 gal container last year that was maybe 24" wide and 16" deep. The roots easily "drilled" down through the middle (for the most part) and actually out the bottom of the container where drainage holes were and into the ground.
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"So we were slammin' beers in the church parking lot..."
"I'm much too young to feel this damn old"
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