I have 9 autos going right now . I am a new grower of canabis I have grown everything else though lol. But I have 4 big devil xxl in flowering right now . But on the oldest plant it has some dark leaves coming out of the top cola . Like almost black . Just a few thin ones . I just dont want to jump the gun and kill the plant off cause we have a bond .I just want to know if this is normal or do I have a big problem.