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Blue-Jay
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I think Will Bonsall told me once or he may have had a conversation with someone at Seed Savers and it got printed in one of their Harvest Editions in the autumn. Will said when pole beans reach the top of his pole supports he trims off the extra growth and doesn't let them try to climb on anything higher than his pole supports. He believed he saw increase pod and seed production among his plants when he did this trimming.Yes, it's to promote branching. I learned about it by accident; I had a semi-runner bean called Mr. Fearn's and I gave the plants large tomato supports to climb. But they climbed waaay too much, so I trimmed the tips several times to keep them on the cage, not above. Was one of the most productive beans that summer. I've pinched a few pole beans since then and it does seem to increase yields. Might be something to try as an experiment to. see what you get! I only pinch when the plants are still in the starter pots, after some true leaves form. I think @Bluejay77 mentioned at some point he knew some one who did that.
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