Why does your Mentha pulegium have brown leaf tips? Diagnose the cause and fix it with our step-by-step guide.
Pennyroyal is sensitive to high concentrations of mineral salts in the soil. When fertilizers accumulate, they draw moisture out of the leaf margins via osmosis, causing the tips to desiccate and turn brown.
As a member of the Lamiaceae family, Pennyroyal prefers consistently moist soil. Allowing the root ball to dry out completely before watering causes hydraulic failure at the furthest points of the leaf, resulting in brown tips.
High temperatures combined with low ambient humidity increase the transpiration rate beyond what the roots can supply. This leads to rapid drying of the delicate leaf extremities in Mentha species.
Pennyroyal can be sensitive to the chemical composition of tap water. Accumulation of chlorine or fluoride in the leaf tissues can cause necrotic spotting and tip browning.
Your plant might also be experiencing one of these issues:
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