Personally, I've never grown pole beans in a container that small, so I can't say how the beans would respond. My suspicion is that you would get vines, but there would be a substantial reduction in yield.

You might have better luck asking your question on the Container Gardening forum, where the posters are likely to have more experience.

Growing pole beans in container is my favorite. If you want a tall vine use at least a 5 gallon bucket I have 4 runner beans and two hyacinth in a five gallon bucket with asparagus, rhubarb and lettuce. Those runner beans are already 8 feet. Hyacinth beans just came up and their short so far.

In one gallon buckets my beans were not long enough only two foot Runners

If you're interested in what I finally settled on (5-gal bean pouches), check this thread: [https://www.houzz.com/discussions/hanging-root-pouch-dsvw-vd~2995865[(https://www.houzz.com/discussions/hanging-root-pouch-dsvw-vd~2995865)

Hi guys! Here is my solution for the bean 'screen'. Please note that i dig the undersoil 12 inches deep then i add the dirt i plant in. I also plant slightly deeper because i find stronger plants. check it out...

Garden layout. 30 ft. x 25 ft.. Dug by hand NO machines.Totally ORGANIC,certification pending. GARDEN 381 can be contacted at pivola3@gmail.com.