Runner beans that fail to set are a common problem, and can be due to a number of factors, including acidic soils, very hot weather that halts germination, cold and windy weather that keeps pollinating insects away, or birds that peck at the flowers. Check the pH of the soil; if it is above 6.5, you don’t need to lime it before planting. The fact that your leaves are yellow suggests that perhaps they are receiving too much water, according to this gardening forum. Check the sites below for more suggestions.
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