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Why are my plants starting to crisp…
- Thread starter CellarDweller
- Start date
Switcher56
Comfortably numb!
It could also be they are finishing or closer than you thought. What do the trichs look like?
The temps sound okay but that humidity during lights on seems a bit low, not too bad but that's more of what I would expect during lights out. I saw someone else mentioned a mold issue was revealed in a different thread though so if you do have mold you probably would want a slightly reduced RH. The numbers your reporting aren't that far off so your problems might be something else. Like Switcher56 is saying it could be just from the plants nearing the end of their cycle, leaves aren't really meant to stay fully green and healthy until harvest. Some leaves will become kind of useless as the buds swell and block them from the light, so the plant will drain what nutrients they can and allow the leaves to die off and of course a dead leaf will start to crisp up even if still attached although usually they fall off first.
Your pH is swinging slightly out of range causing a nutrient imbalance. It's a micronutrient imbalance because it's on the new leaves and not the old leaves. You will still get some nice buds. Buds with burnt leaves taste bad to me and give the weed a bad wrap. Monitor your pH water going in and check your runoff for swings. If your EC gets too high in the root zone it will swing the pH out of range. 
I would be interested in the runoff figures. Viewed from afar, I would think they are burning.
I would have to start there. Though I'm having thoughts towards a K problem. Demand for K is high right now, and a lack will lead to burning signs. Most pics of this online won't be under LEDs and so the burning is quite likely to look differently. I have not seen the traditional signs of K posted for a while. I think we could be at a crossroads, where we are getting the same issues we always have, but they are not looking the same. So many mystery threads these days, and so few textbook cases.
Start with runoff EC and pH if you can measure them. I nearly always start there, as it's routine maintenance.
I would have to start there. Though I'm having thoughts towards a K problem. Demand for K is high right now, and a lack will lead to burning signs. Most pics of this online won't be under LEDs and so the burning is quite likely to look differently. I have not seen the traditional signs of K posted for a while. I think we could be at a crossroads, where we are getting the same issues we always have, but they are not looking the same. So many mystery threads these days, and so few textbook cases.
Start with runoff EC and pH if you can measure them. I nearly always start there, as it's routine maintenance.
CellarDweller
Member
Thank you for the replies guys! really learning here.
luckily the plants in question didn’t have mould but we’re harvested today to be safe.
luckily the plants in question didn’t have mould but we’re harvested today to be safe.
It has something to do with magnesium deficiency/lockout - the cupping of the leaves, the mobile nature of the deficiency (lower leaves are more damaged than higher ones), also the deep blueish green of the neighboring plant point towards magnesium.
If it's deficiency, some epsom salt (MgSO4) would help and also add sulfur for taste/terpenes.
I don't know what the medium is - soil, coco, hydro?
When there’s too much fertilizer in the soil plants cannot take up water correctly. The pressure around the roots gets too high the flow of water reverses. Water always follows salt, so excess salt in the soil will pull water out of the plant leaves. This is where the term burning your plants comes from. The water is flowing from the leaves out the roots and the leaves burn because they don't have water to cool them. Overexposure to nutrients or high EC goes hand and hand with low pH.
CellarDweller
Member
When there’s too much fertilizer in the soil plants cannot take up water correctly. The pressure around the roots gets too high the flow of water reverses. Water always follows salt, so excess salt in the soil will pull water out of the plant leaves. This is where the term burning your plants comes from. The water is flowing from the leaves out the roots and the leaves burn because they don't have water to cool them. Overexposure to nutrients or high EC goes hand and hand with low pH.
Excellent information, cheers mate.
thanks everyone for responding, really helped me finish up the plants ! Harvested a week ago and now dry and into curing jars.
