why is the first answer out of 99% of people is always "mag deficiency"... LOL
come on people do some research it only takes a sec...
to (drewski420420)... well without full details given from the conditions of the plant and its environment based upon a simple picture id say that is a boron deficiency which is highly the opposite around here sometimes you get people just spatting off random deficiencies, preferably mag seems to be the most spouted in the cannabis community sometimes it seems there is never a worry with having a moron deficiency though...
just playin lol
but seriously...