Without knowing any information about the plant at all, my guess is light burn. If you can provide more details then we should be able to help more. See this post so you know what to include in your posts: https://www.mrgrowit.com/forum/grow-community/read-me-first
Are you running synthetic fertilizer? When I see this it's usually caused by excess mineral salts. Could also be too much light, too hot of a light/grow , or a lack of water.
That's generally a nono. I believe that's probably your issue. Switch out soil if you are using synthetics anymore. Unfortunatly the damage is already done for this run.
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Without knowing any information about the plant at all, my guess is light burn. If you can provide more details then we should be able to help more. See this post so you know what to include in your posts: https://www.mrgrowit.com/forum/grow-community/read-me-first
Are you running synthetic fertilizer? When I see this it's usually caused by excess mineral salts. Could also be too much light, too hot of a light/grow , or a lack of water.