I got lucky and found one of those round bean towers on eBay a little over a year ago for a really good price. I do about 4" spacing and can fit 24 pole bean plants on it. The beans are just starting to come up, and I have spinach growing in the center of it that should be ready to harvest before the beans get too tall. Last year I lost track of which variety was on which string and they all looked alike while they were still green. This year I'm only growing two types and marked the top and bottom of each string for one of them with a blue piece of tape.
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