Buds are drying on plat

Hey everyone, one of my friend wasd asking me a question that i could not asnwer. On one of his plants the buds are starting to come along well now but for some reason some of the buds tips are drying out and dying. It is obvious that the bud is not fully mature so we cant figure out the problem. It is happeneing to two of his plants. One of them he uses barley any nutes and they are all organic, and the other one he uses full blast of the right chemical nutes. Please help me out. ALSO LETS SEE SOME BIG OUTDOOR PICS IF YOU GOT EM

if he isnt using hardly any nutes he could be killing the plant. the plants defense is it will eat itself but flowers last. I am not a veteran grower yet, so please bare with me. But I would make sure that your ppm is right in the feed and runoff. Are you giving it enough water? hard to tell do you have any pics? just sounds strange, if your temps are to high, and light is too close it could be burned. I would recomend making sure that your ppm is right,temps straight, and give them a good watering. How are the leaves?