Same here. We’ve been growing them for Upick since 2012. I’ve never trellised them, nor ever pruned out old canes. We do prune primocanes once or twice (generally once) in the early season to encourage lateral branching, as LarryGene mentioned.
Here’s a couple old pics, but they look the same every year. The mowing is what contains them. My rotary mower is 7’ wide, so I just mow over any canes which get in the aisleways.
