My poles (maple) are ~11 feet long, the base buried about a foot into the soil, for an overall height of 10 feet.
With perfect weather, and the right variety, vines can climb to the top and almost all the way back down to the ground.
I need a ladder to help in assembly (and to help in sometimes picking the most flavorful pods that are out of reach. With most beans, I simply pick those that I can reach and let the highers ones go to seed.
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