Severe leaf curl.

Funkentelechy said:

I have some pretty severe leaf curl going on some of the branches of a plant this year. I have been growing outdoor since the mid nineties and have never had any experience with anything like this.
It started a couple of weeks ago. The plant is a Salmon River OG from Dynasty and most of the plant looks great and healthy but a few of the branches look like this.
View attachment 5179098View attachment 5179099View attachment 5179100
I have never had a plant do this, but in researching it my first thought is heat stress. The temps have been between mid nineties to triple digits every day and windy almost every day for the last month straight. The plant next to it(Lava Fields also from Dynasty) is also showing very slight curling inwards on the very tips of new growth of a couple of branches.
The water is coming from a GoGreen hose filter. I've never used a water filter in past years but last year a wildfire burned down most of the town that I live outside of, and as a result of the fire, the municipal water source is all over the place as far as quality is concerned. I don't have any way to test the water PH right at the moment, I ordered a test kit that should be here in a few days. I asked the company that builds the water filter if the filter could change the PH and this is what they said: "New carbon filters are dry and fines will come out when you first run water through them, so you want to rinse those out. Once you've done the initial 5-minute flush the carbon will remain saturated so you won't have to do that again. During the first day or so of use trace carbon particles may exist in the product water causing a higher pH reading than what's coming from your tap, but once the carbon is completely saturated the pH should stabilize and have the same reading pre and post filtration."
I've been running the filter for the last three months now so it seems that by the time that this all started I would have been well past the period that the filter would have any effect on PH, according to the manufacturer.
So what do you guys think, stress from heat/humidity, PH, or something else? Have you ever seen this? It does seem like it is recovering slightly(?) but it's hard to tell for sure and I'm tired of thinking of the theorheticals.

Any experience or suggestions would be greatly appreciated, thanks!

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Funkentelechy said:

I have some pretty severe leaf curl going on some of the branches of a plant this year. I have been growing outdoor since the mid nineties and have never had any experience with anything like this.
It started a couple of weeks ago. The plant is a Salmon River OG from Dynasty and most of the plant looks great and healthy but a few of the branches look like this.
View attachment 5179098View attachment 5179099View attachment 5179100
I have never had a plant do this, but in researching it my first thought is heat stress. The temps have been between mid nineties to triple digits every day and windy almost every day for the last month straight. The plant next to it(Lava Fields also from Dynasty) is also showing very slight curling inwards on the very tips of new growth of a couple of branches.
The water is coming from a GoGreen hose filter. I've never used a water filter in past years but last year a wildfire burned down most of the town that I live outside of, and as a result of the fire, the municipal water source is all over the place as far as quality is concerned. I don't have any way to test the water PH right at the moment, I ordered a test kit that should be here in a few days. I asked the company that builds the water filter if the filter could change the PH and this is what they said: "New carbon filters are dry and fines will come out when you first run water through them, so you want to rinse those out. Once you've done the initial 5-minute flush the carbon will remain saturated so you won't have to do that again. During the first day or so of use trace carbon particles may exist in the product water causing a higher pH reading than what's coming from your tap, but once the carbon is completely saturated the pH should stabilize and have the same reading pre and post filtration."
I've been running the filter for the last three months now so it seems that by the time that this all started I would have been well past the period that the filter would have any effect on PH, according to the manufacturer.
So what do you guys think, stress from heat/humidity, PH, or something else? Have you ever seen this? It does seem like it is recovering slightly(?) but it's hard to tell for sure and I'm tired of thinking of the theorheticals.

Any experience or suggestions would be greatly appreciated, thanks!

Click to expand...

waterproof808 said:

It’s probably a combination of wind and high temperatures. What’s your humidity like?

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Southernontariogrower said:

my guess is mag or Fe def. But is just a guess, folliar spray Epsom salts to determine if mag. Will straighten out fast if is mag. Less is more. 50ppm would be a good starter point imo! Under leds l go as high as 150ppm but that's high. 50 to 75ppm recommended dosing.

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Funkentelechy said:

It turned out excellent. She grew out of the leaf curl and made a full recovery, very productive. I just started smoking the first few joints from her and I like it a lot.

View attachment 5221330
Almost all of the plant flowered normally after recovering from the leaf curl, but there were a few branches that grew out of the leaf curl in weird ways. Like this branch, the calyxes are huge they look like pitcher plants.

View attachment 5221331
I think it must have been heat/lack of humidity, I never found any mites or any other indication of problems that could have caused the curl. It was crazy hot and unusually windy this summer. I increased the humidity and watered more frequently and she didn't seem to have any issues afterwards.

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