I grew some italian purple striped pole beans last year on a wire fence, they sprinted to the top and then kind of wrapped themselves into a tangle. I kept them cut back level with the fence because it was difficult to work around the giant knot once it started toppling over. It probably cut their production down, but I still had plenty of beans and they did grow side shoots and kept going. They just wouldn't work with me on growing sideways no matter how hard I trained them.
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