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I observed something curious and slightly frightening the first time I grew yardlong beans: the plants were covered in wasps. Instead of panicking, I did some reading and discovered that yardlong beans have extrafloral nectaries. While flowers produce nectar to lure pollinators, some plants have additional nectar-producing glands in locations other than their flowers in order to lure predators. Many predatory bugs sip nectar in the absence of their preferred prey, so the extr