When I used to use teepees I found that 2 or at the most 3 plants climbing each pole works the best. Much more than that and the foliage gets so thick it is hard to see the beans to pick and the vines tend to strangle each other off.

JMO

Dave

We are with Dave (digdirt). We plant 2 per pole/string. Works out great.

When I used to grow pole beans, I usually planted 3 per pole, but it was sometimes difficult to see the beans that needed picked as digdirt6 stated. I just like to utilize as much space as possible to maximize harvest even if I have to look a little bit harder for the harvest. Sometimes is is just trial and error to see what works best for you. So many factors play a part in plants growing, so you may find that what works for you does not work for someone else. I would suggest planting 2-3 per pole, and then adjust next year according to how they grew this year. You may find that you could plant 4 per pole. Hope this helps.

Here is a link that might be useful: The Pepper Guy's Blog

The discussion linked below has a lot of information about spacing pole beans on teepees and trellises and what works well and not so well.

Here is a link that might be useful: Bean Pole spacing