Is this normal? Growing in a greenhouse feeding every other watering when 10 gallon fabric pots are light. They are in week 4 or 5 of flower. It has been crazy hot in Virginia the last month.
that looks like a pretty bad calcium deficiency. the most common cause is your ph being too low. are you ph'ing the water you water with AND your feed water? have you checked your ph meter lately?
I agree this looks like Mag deficiency. I have the same looking thing going on right now in my seedlings and it makes sense because its the only thing I didnt reamend for.