Why does your Mentha spicata have brown leaf tips? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlySpearmint is sensitive to high concentrations of mineral salts from tap water or excessive nitrogen fertilizers. As the plant transpires, these salts accumulate in the leaf margins, leading to localized tissue necrosis at the tips.
Spearmint prefers consistent moisture and moderate humidity. Dry air, especially in indoor environments or near heating vents, causes the leaf tips to dry out and turn brown before the rest of the leaf is affected.
While Spearmint likes damp soil, allowing the root ball to dry out completely causes physiological stress. This dehydration often manifests first as crispy, brown tips on the older leaves.
High humidity combined with wet foliage can promote fungal pathogens. While typically presenting as spots, early-stage infection can cause the margins and tips of Mentha spicata leaves to necrotize.
Your plant might also be experiencing one of these issues:
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