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The mint plants grown in pots has some white mold type deposits on the leaf. See picture below. Does anyone know what it is?

mint leaves with some white spots

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That looks just like powdery mildew that we had on our spearmint. I would pronounce it powdery mildew. You could treat it. I hear milk works great for the purpose. There are probably a lot of sites that explain how to treat it. Another solution might be better with mint, though.

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    I tried spraying milk and the plants are in better shape now. Thanks for the tips. – yasouser Jun 8 '16 at 23:18
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    I just wanted to confirm that a milk spray (we use 1 part milk 1 part water) does great at treating powdery mildew and downy mildew. But you have to spray it every day, and for another 7 days after PM is gone. I only used cow's milk. – Bulrush Jun 9 '16 at 18:49

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