Those leaves aren't drying up, they look like they are burning from the tips then inward. I agree with the last reply, you should repot them and then I would flush them with water for a little while before you give them any more nutes...that looks like nute burn or you planted them in a potting soil that is just too hot!. Did you use a potting mix with fertilizers added to it?
nugssgalore Reviewed by nugssgalore on . HELP my plants are diyng and im worried they have lost almost 50% of the leafs they dry up and eventually fall. this is my first grow. they are approx. 7week old i have read a lot but its a low budget grow and im doing my best if could anyone tell me some tips so they don't die they will be very appreciated. heres a video marihuana plant dying - YouTube Rating: 5