leaves curling under??

[BLunTeD4LifE]

hi peeps..

ive got a problem with one of my aurora indica females...

they are only just on day 5 of 12/12, and everything has been great up til yesterday morning,,,

when i went to go check on them when the lights came on yesterday... i noticed that all the newest leaves looked really skinny... with closer inspection i realised that they had been curling under on themselves...

as with a lot of growers at this time of year,,, im expieriencing some heat spikes thru out the course of the 12 hour cycle... but the highest it ever gets is about 31C... ive grown pot in rooms where the temps have hit a good bit higher than 31C, and i have never had this problem before...

im growing in a 3ftW x 1.5ftD x 5ftT cabinet... under a 400w HPS light,,, and im using a 100mm ruck fan and cabon filter for extraction, and a couple of blower fans blowing cold air in thru a hole cut in the bottom of the cab...

im using 70% john ineess#3 soil, with 30% perlite,,, ive only gave these plants 2 small feeds of bio grow so far...

any help/ideas would be gladly appreciated guys...

also if theres any details i forgot to add just lemme know and i will try my best to answer them...

thanks in advance peeps...

P.S. when i first noticed this, the soil was bone dry,,, would this have been the cause of my problem???

 

[BLunTeD4LifE]

"bump"

 

[sproutco]

I don't know what is in biogrow?(be specific about ingredients) What is in your potting soil like peatmoss, bark, dolomite lime, etc? Do you know ph? You can follow the link to test in my signature. More information will help others give you a better answer.

 

[mace_ecam]

Hi BLunTeD4LifE,

P.S. when i first noticed this, the soil was bone dry,,, would this have been the cause of my problem???

i'd say that was your prob, don't let it happen again when its so hot.

mace

 

[froth]

I think sproutco has a secret obsession with dolomite lime. Every post I've read of yours has a reference to this stuff.. Sorry this is so out of context.. But i just had to say it

31 C is about 88 F so I think you're right in saying that this is a pretty high temp for growing but it is not outside the zone where cannabis can happily flower in. But it's defnitely on the hot end of the spectrum. The plant looks healthy with no signs of discoloration so its probably a water/heat issue just like you have all ready reasoned out.

My plants have had their leaves fold upwards from the heat but not downwards, so maybe its something different but who knows.. Logically if you think about this, a plant which is subject to hot temperatures and is low on water will try and save itself buy kind of tucking away its photosynthetic areas on the leaves. This way it can still perform some photosynthesis, but will not be as overworked as if all of its leaf surfaces were exposed.

It's been a while since I've taken plant biology but photosynthesis definitely requires H20 and energy (from the sun or lights). SO if there's a misbalance then the plant will try and do what it can to save face and not burn up.

You're better off taking advice from someone who's not stoned and who actually knows what they're talking about

I try though

 

[sproutco]

I think sproutco has a secret obsession with dolomite lime.

The reason is I wanted to know is to find out his source of calcium. Sometimes leaves will roll under when calcium deficiency starts. Calcium travels in the water from the roots so lack of water in his dry soil would also give a short term calcium deficiency. Watering would help but he also needs a source calcium coming from the soil. I try to not only fix what is apparently going on but also other nutrition problems and environment to better the grow overall now and in the future. All this is really a guess as "eyeing out" what is wrong is sometimes difficult.

 

[BLunTeD4LifE]

it dont matter dude... i dont know what biogrow has in it... its formulated for growing weed isnt it??

my soil is a john innes #3 mix with some perlite mixed thru... i dunno what they put in JI mix?!?!

as for my source of calcium??? i have no fucking idea mate!!!

sorry to be so Blunt,, its just how it is... ive used the same soil mix for 4 years without ever having this problems...

it appears that the problem is getting worse as well.... ive raised my light,,, and took the filter off my fan and stuck the fan as close to the light as possible to try and knock those temps down... as im pretty sure its due to the temps, and me stupidly letting the soil dry out to much...

thanks anyway guys,,, i guess its just something im going to have to put up with and see if it will ride itself out...

 

[froth]

sproutco, i hope you weren't offended.. I've found that you're pretty knowledgeable in all your posts that I've read around this forum. I just found it funny

 

[MynameStitch]

calicum mostly causes potting before that leaf curling under

i never sen calicum problems wioth leaf curling under


those temps need to come down to
how much fresh air comes in your grow room and what lighting are you using and how close is it to the plants?

how often are you watering your plants?

how close is your lighting?

 

[BLunTeD4LifE]

thanx stich,,, i kinda didnt think it had anything to do with calcium myself...

right... as for a measurement on how much air is coming in to the cab...

the only kinda measurement that i can give u there... is... there is enough air coming in...

i have a 2.5inch hole cut out of the bottom of the cab that runs the entire 3ft... and then i have two blwer fans blowing fresh air into the cab from the outside...

im running a 400w HPS which is fixed right at the very top of the cab,,, and is around 2.5feet from the tops of the plants... maybe more... i cant measure the distance as the lights are off atm... but its around about 2.5ft away...

im watering as and when the soil drys out.... sometimes 2 days,,, sometimes 3 days..

problems still continues with this plant,,, and shows no signs of improvement...

any suggestions would be gladly appreciated... so long as u dont need to know whats inside my nutrient solution or what my soil make up is... coz i dont know the answers to that questions.... im sorry that i cant be anymore specific about those things,,, but how many folk actually goes and finds out the exact content of their bag of soil they bought from a garden store or the content of their 3 part nutrient solutions????

not me anyway thats for sure...

 

[Blackmelo]

well take this advice with a pinch of salt because up till now I seem to be the only one on IC who believes this behaviour can happen from too little airflow but I seriously think that is what it is.

Especially if you have temps above 30 degrees C, your airflow is too little anyway.

 

[PazVerdeRadical]

Blackmelo, um... you may be up to something there for sure... airflow is freaking important Blunt, try misting your plants with fresh water every day, twice, mid-morning and sun-down. it will help the plant cool down and hydrate itself.
peace and good luck!

 

[MynameStitch]

i would move the light up and put a temp gage under the canopy right above the troubled areas and see what it reads., leave it there for an hour and see what you get

i think it might be some issues with light being toclose

or magniseum issues but most of the time when they curl like that its from moisture stress or heat issues


but i still say to little air and to close to the light

m watering as and when the soil drys out.... sometimes 2 days,,, sometimes 3 days..

how much water are you watering them with?

what size are the plants and what size pot are they in?

 

[BLunTeD4LifE]

thanks again guys...

lights just came on and i went to check em... and it appears that the leaves are sorting themselves out now...

i raised the light to the highest position possible.. and then i took the filter off my fan., and the fan is sitting right next to the light extracting the hot air out of the box...

blackmelo... if u can tell me a way to get the temps down anymore in this box i would love to hear them...

the temps outside the box in my room are 25C... so i think that im doing really good managing to get them down as low as 30C...

until i get money for a cooltube opr air cooled hood there isnt really much i can do to get the temps any lower... or is there??

p.s. stich i use 10ltr pots, and i water so that only a little trickle comes out of the drainage holes... ir eally dont measure the amounts tbh... sorry i cant be more specific bro...

 

[Blackmelo]

stronger extraction fan would do it...
or get a second one on top of the one you have...

 

[Verite]

It looks just like the newest leaves closest to the tops and the lights which kinda seems too local to be an overall plant issue. The first few days of 12/12 are going to be sensitive to those leaves as well. Mist em keep the plant watered well and pull the light back a few inches until they look better and Im betting they perk back up.