Why does your Origanum majorana 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 live in the upper layers of moist soil and feed on organic matter and plant roots. In Sweet Marjoram, high infestation levels can lead to root damage and stunted growth.
Sweet Marjoram prefers well-draining soil; constantly wet conditions create the perfect breeding ground for fungus gnat larvae. Overwatering also increases the risk of secondary fungal pathogens that attract these flies.
Fresh compost or peat-heavy mixes used for Marjoram provide an abundant food source for fly larvae. If the medium is too rich and stays damp, fly populations can explode.
Your plant might also be experiencing one of these issues:
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