Just a quick question:
Do burnt leaf tips turn green again?
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Short answer? No.
Anything that is brown/dead will not turn green again.
Pay attention to the new growth to see if it’s healthy. Which doesn’t look like it to me right now.
The damaged leaves won’t get prettier. But they also won’t get worse, if the problem is fixed. 
Kind regards
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Cool tip with the bottle overnight, my XXX lamp grilled the top part through the cap.
And that with 55cm distance and max. 115ppfd.
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And all in just 2 hours of light!
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Nah they’ll stay the rest of the life cycle unfortunately.
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For vegetative growth, you want between 300 and 600 ppfd. In flower, you want between 500 and 1000 ppfd with no CO2. If using CO2 at 1000 ppm, you can add 200-300 ppfd to both veg and flower.
So, for years, I’ve been placing bottles or cups over my plants during the first 2-4 weeks, and I’ve never had any burns on them.
I had seen that picture, but as I said, that has never happened to me, and I’ve been doing this for a very long time now.
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Black on white. Or rather: Brown on green! 
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I don’t deny it
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We have already found out that the soil was also to blame. For such a small, sensitive plant, a 15L pot was too big. As a result, I couldn’t water properly, and the plant couldn’t absorb its nutrients correctly, and no drainage was created. I repotted it again into a smaller pot with a mesh net underneath and loose soil. Let’s see if it works.
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Hope it turns out well. I’m very sorry about the burn. But as I said, I always do it this way and haven’t had that happen before. Others do it this way too, and I haven’t heard of it happening to anyone else yet.
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I’ve heard it from everyone, read it myself, and actually knew it too. But I’ve never tried it myself. I hope she makes it again.
I’ll share now and then if she made it and how she’s doing.
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OK, normally it’s like a weed, she will survive. It might cost a few days in veg.
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Still thanks again 
If it makes it, will the now burned leaves remain at the bottom or top of the main stem?
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The leaves will stay in place and new ones will grow above them. When the shoots in that spot are big enough, you will be able to cut them off. The plant grows at the top; everything that is there now stays at that height.
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Because it’s usually the small lower stems that are among the first to be removed later anyway.
So I hope that my baby now grows into a wonderfully beautiful woman without further problems. 
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