Why does your Origanum vulgare have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnats, whose larvae live in the top layer of moist soil and feed on organic matter or decaying roots. High humidity and consistently wet soil in oregano pots create the perfect breeding ground for these pests.
While less common as 'flying' pests, certain aphid species can appear as small dark insects crawling on stems. They suck sap from the oregano's tender leaves, often causing leaf curling or stunted growth.
Weakened oregano plants due to nitrogen or magnesium deficiency can become more susceptible to soil-borne pests. The 'flies' may be a symptom of an underlying decline in the plant's physiological health.
Your plant might also be experiencing one of these issues:
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