First grow [Wilma/Scrog] Help!

Hello buds,

This is the first time I post on this community but I've been reading quite a lot and decided to go for my first grow.

Could you please tell me what is wrong with my 4 OG Kush? I started germination on the 13th of December. I think they are growing too slow.

My first plant has some brown dots on her first set of leaves:



Second and third plants have some curly leaves:





(That one looks much smaller than the others too)

Fourth plant looks kinda ok:




And the data:

- Lights: 250W HPS hanging 45 cm over the plants with a narrow reflection setting. 18/6 cycle. Will switch to 400W in vegetative.

- Water temp in the reservoir: 19C with a hysteresis of 1C. I am also fluming the water that comes back from the chiller so the 50L in my reservoir are oxygen rich and not stagnant.

- Feeding twice a day with the blue drippers for 15 min each (within the first hour of lights on and before lights off)

- Temps: 21C lights off, 24/25 lights on

- Humidity: using a humidifier connected to a timer that keeps 65-70%

- Nutrients: 1/4 of micro, grow and bloom (general hydroponics), katana roots and PH 5.8.

- Oscilating fan connected to a str transformer in low setting aimed just over the plants, not directly. They just 'vibrate' from time to time, which I believe it helps to make the stem stronger.


I'd really appreciate some help and tips so they don't end up dying. I have a couple of questions too:

- I started them on rockwool cubes. Where exactly should I stick the drippers? I'm afraid they are not getting enough water.

- I plan to do the 4 way lst before scrogging. They have 3 nodes, should I wait for the 5th node to top? If not, when should I top? I plan to top twice by the way, so I can get 4 main colas.


I'm kind of freaking out since I spent a lot of money on my setup and I don't want to lose these 4 girls. Thank you very much in advance guys.

leaves are what some call "tacoing" basically they close in like that and have raised edges like a taco basically because of heat stress. either your lights are too close, humidity is too high for them, or lack of air movement; or any combination of the 3.

as for the twisted leaves honestly idk what that is caused by but i've had the same but not as bad they didn't turn out bad though

as for the brown spots i am not 100% but likely a nutrient deficiency of some sort; couldn't tell you which nutrient since im not skilled enough in that department. idk much about lighting either but i run my 2000W actual draw at higher 300's no less then 24 inches. your running yours at 17.7 inches basically so i think it's how close your light is. i would raise it higher. humidity to me seems okay

thats just my 2cents i'd wait for more experienced people to drop in and see what they say.

I’ve seen/had twisting leaves with bad ph management

Thanks for the responses. What about the drippers position and when should I top for scrog?