Strange Problem.

hi. this is the problem.. about 70% of the leaf tips have turned yellow/brown and the 50% of them have curled up/down and died.. though THERE AREN'T ANY YELLOW LEAVES OR YELLOW LEAVE MARGINS.

that's why i'm confused.i thought it wan N def at start but as i told i have no yellow leaves... anyway my setup is.

custom grow box, bagseed, 2nd week of flowering, 380 watt cfl, soil (biobizz all mix), nuts biobizz (grow,bloom only.) 18 litres/4 gal pot.
vegged for 50 days beause of a prob (they stayed 20 days with fluoros t5).

my biggest prob is the temps. with lamps on i.m ok. 22-23C / 72-74F but with lamps off i'm falling to 11-12C / 52-54F. i also have a lot of red stems.i'm a bit high in humidity too for flowering i guess. (50-65%)

the pic isn't the best but you will notice that except the first or second node there is no where else yellow leaves. the problem is getting worse but slowly.



EDIT : maybe this??? Potassium: Leaves have a papery appearance; dead areas along the edges of leaves; growth is stunted...

red stems.......P deficiency?..........warm her at nite.......a seedling mat.

It seems like you have a compound problem....sounds like a calcium def ...if the leave are brittle also purple stems poinr to an potassium def....theres a guide to nutrient deffenciey/toxicity in marijuana plant problemz spark up....do sum reading ....diagnose youre problem youre self....doctor...lol

believe me i've searched a lot for this problem before starting the questions. i'm a rookie but not a lazy one... the thing is that i'm confused..

a)red stems : i think there might be from temps.at least this is what i understood from guides.
b) a lot of problems in guides talk about yellow and curled tips, but they also say about yellow leaves which i don't have any... that's why it's strange.


d) any other ideas?

i'll try to take better pics.

it's me back again.i have left with 2 girls so the grow is still alive. the problem i had with the first plant continues. it's growing ok but all the new leaves come out with the same problem. sorry for the pics.believe me it's the best i can do for now. it's the third week of flowering and only the one has the problems.the other it's really well indeed. and they have exactly the same set up, soil, pots, and everything.. any ideas would be appreciated.

hi. this is the problem.. about 70% of the leaf tips have turned yellow/brown and the 50% of them have curled up/down and died.. though THERE AREN'T ANY YELLOW LEAVES OR YELLOW LEAVE MARGINS.

that's why i'm confused.i thought it wan N def at start but as i told i have no yellow leaves...

Click to expand...

anyone???? any thoughts??

over fed?
overwatered?
soil has acidic pH?
disease?

could be anything need more info.

To cold you just said it. 11 to 13c is way to cold it likes 25c just like you and me. Your nuts would shrivel up with frost bite if you were to sleep that cold everynight and you would get sick like your plant.

facing the same, or at least similar problem...thinking over fed and over watered...