I switched to a more powerful COB led and some of my plants leaves are droping and have this symptoms. I think It is light Heat stress but im not sure, any help is welcome. Thanks!
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HELP! Is this light stress/heat stress?
- Thread starter Indoor55
- Start date
azorahai
New member
In my experience, light burn begins with bleaching at the tips and sides of the upper growth (closer to the light source), and it looks very different from what I'm seeing in your plant. Where are these symptoms first showing? If it's in the lower leaves (older growth), it's probably potassium deficiency. Are you feeding it any nutrients?
Yes, but i tend to add small ammounts, so maybe i have to increase the dosis...
​​​​Some plants started bleaching on the tips of the branches, and leaves were down and dry. Also some leaf tips were burnt. Im certain that they have suffered light stress but, as you say, the symptoms in the pictures Dont look like light stress so i don't know
​​​​Some plants started bleaching on the tips of the branches, and leaves were down and dry. Also some leaf tips were burnt. Im certain that they have suffered light stress but, as you say, the symptoms in the pictures Dont look like light stress so i don't know
azorahai
New member
Perhaps share more pictures from the whole plant and the areas affected. How often are you feeding it? Do you have a TDS meter to keep track of how many ppm is put in and runs off? It's not completely necessary, but it's nice to have. A very low run-off ppm after watering might be a sign that you should increase how often or how much you feed, for example. Alternatively, a very high run-off ppm might indicate you're close to or already over-feeding it, which could burn your plant and lock it out of nutrients in the substrate/soil.
There's always the possibility of a pH problem (possibly too low), which could hinder the plant's capability of absorbing some nutrients. Those cheap pH strips are helpful, but a pH meter is recommended.
There's always the possibility of a pH problem (possibly too low), which could hinder the plant's capability of absorbing some nutrients. Those cheap pH strips are helpful, but a pH meter is recommended.
RetiredGuy
New member
Instead of watering with pH 6.5 water, increase the pH of your next watering to 7.0 to increase the runoff pH.
azorahai
New member
Sometimes it's hard to accurately identify the problem, but you can narrow it down significantly. You've already raised the lights, and I'd say your pH of 6.0 is mostly fine, so all that's left from what was suggested here is to up the nutes in your next watering and see if it stabilizes or not. The blemishes won't disappear, but they shouldn't grow.