leaf tips twisting.

[din5]

Hi
hopefully someone can give me a bit of advice on my autoflower.
250w led panel
ec at 0.8 ive lowered it from 1.1 ec as thought I might be over ferting
ph 5.7 of res in autopot system
canna coco coir 50/50 with perlite, 1 inch pebbles on bottom and top
temps in pot are steady 19-21 lights on and off
room temps 23.5c lights on 19c lights off
ive been feeding 1ml canna a+b and 1 ltr and cal-mag 1 ml ltr, and cannazym
res temps 19.5c permanently
lights 20 inches above canopy
rh 45-55 lights on 60-70 lights off
20/4 light cycle
polar express autoflowers
5wks 5 days old,

first time growing in coco, struggled to start but slowly getting the hang of it.

the problem I'm having is the leaf tips are twisting on new growth and some of the older growth, it does not seem like its getting really bad but I would love it if one of you coco pros could give me some advice.
heres the picture of the issue.
the little leafs look like they got nute burn but its not there starting to twist so its actually the underside of the leaf your seeing. I will try and get some better pics so you can see more clearly.
any help would be greatly appreicated
thanks.

 

[Royster213]

Hey bro I had the same problem, I read that it's from the light or the heat and what is happening is the plant is trying to protect the leafs so they twist. Now don't quote me on that I'm going on what I've been told but I changed my room and dropped the temp about 5 degrees Fahrenheit and they stopped twisting so I assumed that was the problem. Just started autos so I'm no expert just passing on what I heard and what helped me. I've gotten a lot of useful information from AFN just trying to return the favor. Any body have anymore info I could use it as well

 

[Royster213]

By the way I'm a soil guy have done dwc in coco 1 time with one plant in a one gallon bucket did well but I'm no coco pro just trying to help bro best of luck to u

 

[din5]

Hi royster
That does make sence as I'm growing in a 2ftx2ft space with autos . Ive alway done soil myself and with photos , this is only my 3rd attemp with autos and 1st attempted in auto pots and new grow space I used a 4x4 tent before or outside . And to be honest I've never had any problems in the past but this setup seems a lot more hasstle than what I did with soil. Think I'll raise my lights a bit more,

That may be the issue it's not a heat issue . The led panel I've been using for the last few grows is a 3w vipar led a300 panel . They do say it will cover 120x120 area but as it's only pulling 250w from wall I figured my 2x2 space would be fine .

 

[Royster213]

I never used or seen an led but I hear they do not run hot so it shouldn't be heat. I'm not sure if what I did solved the problem, I believe it's shitty genetics I could be wrong probably am every auto I grew had some type of mutation, or deficiency or twisted leaf tips so I only got seeds that have proven to be genetically stable Dutch passion is a very good seed vender like I said I'm not a pro but I can read. The led should be good to use in any room I don't see that being an issue. I would like to know definitely what makes the tips twist, if I see anything I will let u know and u do the same I have Seen it a few times but nobody can say 100% why

 

[din5]

well the seeds I got are from original seed bank in spain so should be good, ive grow one of the seeds summer last year with no issues at all, it was large like 3ft plus but was absolutely perfect tho I was using soil.
this time I got 2, one is shorter than the other, ones about 18inches and the other about 15inches both starting to flower, the one that's 18 inches is not showing too much twisting the smaller one is,
and getting worse, today a couple of the large fan leaves are starting to twist from tip to about half way up the leaf.
tbh it could well be RH as mine sits around 39-50 that's all I can put it down too tbh. or possible overnuting but atm its sat at a ec of 0.8 so they should be showing signs of sorting itself out but its still progressing, admittedly it did have a bad start so that may be a issue aswell.
if I ever find out the cause I will certainly post here to help you and others with the same issue.

gess ill hang it out and see what happens ill keep you updated and if anyone looks at this thread and knows the answer please share I and other will be eternally gratefull

cheers d5

 

[din5]

I never used or seen an led but I hear they do not run hot so it shouldn't be heat. I'm not sure if what I did solved the problem, I believe it's shitty genetics I could be wrong probably am every auto I grew had some type of mutation, or deficiency or twisted leaf tips so I only got seeds that have proven to be genetically stable Dutch passion is a very good seed vender like I said I'm not a pro but I can read. The led should be good to use in any room I don't see that being an issue. I would like to know definitely what makes the tips twist, if I see anything I will let u know and u do the same I have Seen it a few times but nobody can say 100% why

hi
ok I figured what my problem is with the twisting of the tips, I think ..

basically as I'm using coco and autopot system, I didn't relize how to test for overfeeding as it was feeding from the bottom, I presumed the plants would take what they need and no more, that's not the case the tips curling is basically overfeeding, ill follow the autopot guide for checking the runoff of the coco when its emptied the rez in the pot ill copy and paste the info for anyone else who, like me didn't follow the basics for autopots and coco


An important factor to manage with the AutoPot system is the nutrient strength. Keeping a close eye on the EC in the reservoir and the pot will lead to a healthy and successful crop.

An easy way to check the nutrient strength in the pot is to shut off the supply of nutrient solution and allow the tray to become empty. Once the tray is dry, take a jug of nutrient solution from your reservoir, note the pH and EC, and slowly pour through the top of the pot until the tray is � full with run-off solution. Take a sample of the run-off from the tray with a syringe and measure the pH and EC. You should expect the EC to be slightly higher (EC 0.2-0.4 CF units) and the pH to be between 5.5 and 6.5.

If the nutrient strength is too high for your plant, you have a few options. You can refill the reservoir with a weak nutrient solution (EC 0.5-1.0/CF 5-10) and continue using the Aquavalves. Or, or if your plants are showing signs of over fertilisation (burnt and curled leaf tips), keep the Aquavalves turned off and top feed your plants for a few days with the weak nutrient solution. Avoid flushing using water only as large swings in nutrient strength around the root zone can cause further stress to your plant. Your aim is to slowly reduce the nutrient strength back to your desired acceptable level, not flush out all the nutrients.

If after testing the nutrient strength you find that it is lower in the pot than in your reservoir, then you should increase the nutrient strength. Remember, only increase your EC by 0.2 units (CF 2) every 1-2 days as a large change in nutrient strength may negatively affect your plants.

hope other people follow this advice, I will post a confirmation when ive tested my runoff in my pots, kinda feel like a muppet not looking into the runoff

 

[din5]

done my run off test and they were 0.2 differents from what I pored in through the coco and the run off, so gess that was not my issue I gess it may be the colder temps causing the leaves to twist , tho it does not go below 21c or above 25c
they look fairly healthy apart from the slim leaves growing and twisting.
perhaps it was not a great idea to change my whole growing style in one hit.

 

[Royster213]

Hey bro, like I said I can't 100% say what the problem is I dropped my temps 5 degrees and the twisting stopped,I think I just got lucky. From what I take from everyone is that it's most likely some type of heat or light stress and the leaves are trying to protect them selves. My opinion there is no way it's nutrients. If u think about what they are doing, they are basically trying to flip upside down Wichita would lead u to believe they are trying to protect them selves from something. Have not heard anything about it being Nute deficiency. Another thing I think might play a part is shitty genetics. Hope the best for u bro.

 

[namvet25]

If your talking about the twisting and lighter green tips on the new growth on all the tops that is rather normal and nothing to worry about.They will be fine when they get a little bigger.