Why does your Salvia officinalis have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The presence of tiny black flies in sage is most often due to fungus gnats, whose larvae thrive in the moist organic matter of overwatered sage soil. They feed on decaying plant material and can occasionally damage the delicate root hairs of the Salvia.
Small, dark-colored flies can sometimes be confused with aphids or other biting midges that congregate on the aromatic leaves of sage to feed on sap. These pests are attracted to the high moisture levels often found in the sage's growing medium.
If your sage is kept in a highly humid environment or near decomposing organic compost, fruit flies may be attracted to the fermenting sugars in the soil or nearby decaying matter. While they do not feed on the sage itself, their presence indicates an issue with moisture management.
Your plant might also be experiencing one of these issues:
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