Why does your Origanum rotundifolium have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe tiny black flies are likely fungus gnats, whose larvae thrive in the moist organic matter of Origanum rotundifolium's soil. They feed on decaying roots and fungal mycelium, which can stress the plant's root system.
Excessive soil moisture attracts fungus gnats and creates an environment for Pythium or Phytophthora species. Round-leaf oregano prefers well-draining soil, and constant wetness promotes both the flies and fungal pathogens.
While usually stationary, some aphid species can appear as small dark moving dots on tender oregano foliage. They suck sap from the plant, causing leaves to curl or yellow.
Your plant might also be experiencing one of these issues:
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