my curling leaves.
- Thread starter Desr
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Nubby Tubbs
New Member
my vote is overwatering/low temps.
Brick Top
New Member
Over watering would be more of an overall droop.
When the leaves remain upright like normal and but they curl down like if you held your hand out and turned your fingers down and then as it progresses the leaves roll under, like they are folding in on themselves downward, on the underside of the leaves, and the leaves end up looking like the Cryptkeeper's fingers then that's 'the claw.'
What I see in the pictures is not over watering.
When the leaves remain upright like normal and but they curl down like if you held your hand out and turned your fingers down and then as it progresses the leaves roll under, like they are folding in on themselves downward, on the underside of the leaves, and the leaves end up looking like the Cryptkeeper's fingers then that's 'the claw.'
What I see in the pictures is not over watering.
pelt1
Well-Known Member
Is "the claw" bad, and what causes it?
Brick Top
New Member
Yes 'the claw' is bad. It is caused by excessive amounts of nitrogen and it damages the vascular system of the plant resulting in roots will be under developed, yields will be decreased due to flowering slowing down which means less and slower bud growth. Water uptake is slowing down from the vascular breakdown of the plants as well. As it progresses the leaves will take on a dryish look, like they need water but not severely, but the plants will not use as much water as normal. That's because transpiration goes up but the damaged vascular system will not be capable of taking in enough water to replenish all that is lost ... thus the dryish look.
Normally what happens is people pour on the nutes in veg, right up until it's time to flower to try to get as much vegetative growth as possible, and vegging nutes, as we all know, are higher in nitrogen. A buildup in the soil occurs and even though someone switches to flowering nutes when they go 12/12, and the flowering nutes have lower amounts of nitrogen, with what is built up in the soil plants get way too much nitrogen in flower, especially early in flower, causing the vascular damage.
That's why I asked if the plants were in flower and if so how far into flower.
People need to back off on their vegging nutes earlier and or flush before going to flowering nutes to make sure there is no chance of 'the claw.'
Now I am not saying the plants in the pictures have 'the claw,' but it does look like it might be the early stages of 'the claw.' But it is not a case of over watering and from what I could see there wasn't any signs of other sorts of problems that if there is a lockout problem would likely be seen.
A Potassium deficiency will cause leaf tips to curl down but it will also cause necrotic spotting on the lowest leaves and the leaves will appear pale yellow. I didn't notice that in the pictures and if you don't see it, then that's not it.
A Copper deficiency can cause leaf tips to curl under, but that is a fairly rare deficiency. With a Copper deficiency you will also see a lack of growth, growth tips die back, green leaves will show a bluish hue and plants may have a hard time showing maturity in vegging stages. Copper deficient plants causes irregular growth and wilting in the newer growths. The Leaves at top will wilt easily along with bleaching (chlorosis) and necrotic areas in the leaves. Leaves on the top of the plant may show veinal chlorosis.(bleaching of the veins). I didn't see any of that in the pictures and if you don't, than that's not it either.
Brick Top
New Member
When you have a nitrogen lockout situation you will see things that are not seen in the pictures. Nitrogen is the biggest mobile element meaning it can travel anywhere on the plant. Usually the deficiency will start on the lower to middle part of the plant, and then will usually happen to older leaves first. Then the deficiency will work its way up the plant. A plant can be green on top, then yellowing on the lower leaves when the deficiency is starting out. Sometimes in bad cases the leaves will turn a purplish color along with the yellowing. A nitrogen deficiency will start from the leaf tips and work its way back to the leaf node. If plants are having a slow growth rate and have yellowing of the leaves, then most likely it’s a nitrogen deficiency.
I did not see that in the pictures.
Brick Top
New Member
What types of nutes are you using, who makes them?
It might not be 'the claw,' but it does look like the early stages of it. Are there any other symptoms you can spot, anything else going on anywhere else on the plants other than the leaves you asked about? Any discoloration or any twisting or anything out of the ordinary?
