The planting suggestion was for dwarf borlotti beans which to be quite honest I think produce a poor crop so mass planting per station would at least produce a reasonable crop for the ground used.
With climbing beans I prefer one plant per cane. I usually have a double row across the plot and this produces more than enough beans for us. Rather than planting the beans direct at the allotment I grow mine in cells in the greenhouse first.
Really it is down to how prolific the variety is and just how many beans you want to eat fresh, frozen or dried.
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