Could also be high pH.
Here:
http://www.420magazine.com/forums/problems-pests-disease-control/81275-cannabis-plant-pest-problem-solver-pictorial.html
"The last pic is shown is high pH with the twisty leaves."
My temperatures are high. Around 29 C (84.2 F). So is the humidity. 60% ish most of the time. I guess everybody is busy inspecting their buds. Thanks nova1992 for pointing out the heat stress.
Hi everybody,
English is not my mother tongue so I apologize for any mistake.
Beginning of May I planted some bag seed. I did not grow anything before and I learned everything from the web.
Seeing the seedlings coming out of the soil was such a wonderfull thing that I wanted to care for them...