Why does your Mentha × piperita have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyPeppermint prefers moist soil but cannot tolerate waterlogged conditions. Excessive moisture displaces oxygen in the soil, leading to anaerobic conditions that cause chlorosis (yellowing) and eventual root rot.
As a fast-growing herb, Peppermint has a high demand for nitrogen. A lack of available nitrogen prevents the production of chlorophyll, typically manifesting as uniform yellowing of older leaves first.
If the soil pH becomes too alkaline, Peppermint cannot uptake iron effectively. This results in interveinal chlorosis, where leaves turn yellow while veins remain dark green.
While primarily known for orange pustules, an early infection can cause leaves to lose their deep green color and turn yellowish before necrotic spots appear.
Your plant might also be experiencing one of these issues:
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