Honeydew more commonly refers to the sweet sticky substance produced by aphids and some other insects as the feed heavily on sap. When produced directly by plants it is usually nectar from extrafloral nectaries. It isn't much different than flower nectar, and it attract ants and other predatory insects. Sometimes when plants have an abundant water supply and high humidity it can actually just be sap that is forced from nodes and leaf tips by the internal pressure generated by water uptake by the roots. As long there are no obvious insect pests present it is a sign of an actively growing plant that is at least reasonably healthy.
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