First Grow - Need Some Advise!

[Mr_buDz]

Hi guys, First time growing for me and my 6 plants seemed to be going okay, until i noticed some of the edges of the leaves are starting to curl upwards, and some are curling to the left or the right, Ive tried keeping my ph levels between 6.0-6.5 which i have read is recommended. I have raised the lights from 50cm to 70cm as i thought maybe they were getting to hot. Ive been Using a digital PH meter which has recently been calibrated. Please help as im not sure if this is normal or not. The Plants are now 2 weeks old and are growing in soil. Also can anyone tell what strain these guys are?

What strain? - Unknown
How old? - 2 weeks exactly
What type of medium? - Coco / Pearlite
What type of lights? - 4x600w hps and 1x600w mh
How far from the lights? - Around 70cm
What, how much and when was it fed? cf 1400ppm ( Full Strength, Was advised To Use Once 2nd Week)
What is the medium/runoff pH? - 7.0
What are the temps and humidity in the room? -20/22d Celcius When Lights Are Off, 27/28 Celcius When On
What size pots? - not sure, tops of pots are arouund 30/35cm wide

[SmknVTEC]

Mr_buDz, first off welcome to the city.
Second thanks for reading some threads and using my cut and paster as a guide to your grow details. It really speeds things up and I can help on this post. For your medium I would recommend pH between 5.2-5.8 because it is soil less. However your plants look pretty good so whatever you are doing works. The reason for the leaf edges curling up over themselves is classic heat stress. Add a fan, exhaust or whatever it takes to lower temp a few degrees and it will stop. If you don't no real biggie because the stress is very minor.

[Mr_buDz]

Thanks alot for the warm welcome SmnkVTEC, Just a quick question to your reply, you say the PH needs to be in the 5.2-5.8 range because my growing medium is ( soil less ) do you mean if it was rockwool? becauses mine are growing in Coco Soil. should i bring the ph down to 5.2-5.8 even tho im using coco? Also any idea on the strain or breed these guys are?

Cheers mate

[KittensOnPCP]

I don't know much about PH, but it's pretty much impossible to tell you what strain/species it is because there are so many strains, however the leaves look thinner and that usually points towards Sativa (I think!).

BTW- your plants look really nice and bushy, but 4x 600 watt HPS for 4 plants? That must have cost a pretty penny.

[SmknVTEC]

Hmm cocoa soil I don't know. I would go 6.2 just so you are at the low end for soil and just out of range for hydro.

Strain is mostly sativa to pure sativa as KittensOnPCP said.

[Help_Needed]

Cocoa is a "soilless" medium and generally is treated very similar to hydro. I believe that you want the same pH range as you do in hydro; 5.5-5.8, but I'm not 100% certain of that. I'm checking with a couple of experts to confirm the pH range. I'll let you know what I find out.

[Mr_buDz]

Thanks everyone for your help and ideas, i appreciate it and it seems your advise has helped my plants regain there normal and natrual state! There not longer curling!

Thanks all

[SmknVTEC]

Yeah if it is soil-less 5.5-5.8 should cut it. Glad we helped, good luck.