I have 6 plants all look great except 1, it continues to get
more brown spots about half way up plant. Added 1/2 strength cal mag to the last two feeding. Tried foliar spray with cal mag yesterday. Spots have spread to top leaves today.
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have you spilled water on ur plants when watering them?
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Agree with @BudzMS and would mention that you shouldn’t mist the leaves with the lights on or you’re going to cook those leaves 
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Now that you mention it. I think I did a couple feedings ago.They could have gotten burned?
Would the explain the the top leaves starting to get small brown spots now after foliar spraying cal mag?
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Wish I would have ask first.
So now what?
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No more spraying.
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Yes sir. No more spraying.
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no more spraying while lights are on, spray when the lights go off, so they have time to dry before the light come back on, thats if the lights go off. @beachglass is our sister growmie. 
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my ears hurt lol
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Spray only in the dark I’ve heard that somewhere
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Go full strength on the CalMag too. She’ll need it
Thank ok
The reason you want to spray when lights out is the water drops will act like a magnifying effect. As a kid we would start fires with a magnifier and dried leaves. Poof…fire.