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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

yasouser
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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.

Brōtsyorfuzthrāx
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    I tried spraying milk and the plants are in better shape now. Thanks for the tips. – yasouser Jun 08 '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 09 '16 at 18:49