Does anyone know what this discolouration on my peppermint are? Last year, I was growing this peppermint and it become big and beautiful, until suddenly this started happening – slowly spreading across the plant, and eventually killing off everything but one single stem.
After overwintering it on a single stem, it finally decided to pop back up this spring, but now I'm starting to see the symptoms again 🙁
The plant is in a south-east facing window in Zone 8A, and I only water it when the topsoil (2-ish cm) feels dry, so I don't think it's a watering issue.
by This_Palpitation2499
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