The Q&A Archives: Moldy Catnip Leaves

Question: My Catnip plant was doing well. Lately I have noticed the leaves have a greyish "mold" on them. What is causing this? How can I fix it?

Answer: Based on your description, it is possible the plant is suffering from a fungus or mildew. This can be caused by overwatering, excess moisture on the foliage, poor air circulation, or by temperatures that are too hot or too cold, or a combination of any of these. Sometimes, too, a plant can become soft and succulent if it is grown in less than ideal light and/or provided with excess nitrogen and this can make it susceptible to such problems. Try to remedy the cultural conditions and be sure to remove any affected leaves to reduce the source of reinfection. You might also consider trimming it back to increase the air circulation among the stems and foliage. Good luck with your plant!

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