This is a common problem when you have orchids in your garden; the sticky substance that's usually found on them. At times, this sticky substance is refereed to as sap (which comes from the orchid itself) but to experienced gardeners, some of these are secretions from pests such as aphids and mealybugs. Primarily, treating this sticky substance usually starts by checking if your orchids has insects nearby. Here are some other ways on how to treat the sticky leaves in orchids.

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Source: Gardening Know How