Many orchids (and some other plants, e.g., peonies) are programmed to exude a sweet sap from parts of the plants other than the inside of the flower. The purpose of this sap is to attract ants which use the sap as an energy source. In return, the ants protect the orchid from insect pests that feed on the orchids. On my orchids, I often see sap (many refer to it as "happy sap") along the spike and at the base of the individual flower stems. This is exactly where you would want the ants to gather in order to protect the flower, the reproductive future of the plant. The sap you see is a genetic holdover from the orchid's ancestors.
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