all of plants fan leaves turning yellow and den crumbles up and falls off?

i have a plant taht is about in its 3rd week of flowering and all of the fan leaves are falling off. the leaves first turns yellow den crumbles up and falls off what can be my problem? all help would be greatly appreciated

Dude I would do a google picture surch you can get relly far there. I was having the same problem I just mixed some new fox farm soil with some worm castings on Friday and there doing great

Are you giving them to much nutes?

they will do that in flower.. get a pic up if u can.. but not to worry, unless they are lacking nitregon... pic would help