I think its the humidity thing that Im always trying to get right,, kinda hard for me to get it right, I live in the middle of the desert, Im hoping to move my grow space to a much bigger area in the winter when I am hoping to have much better luck,,,, summers are far too hot 110 lately and gettin hotter by the day and DRY, its far from impossible for me to get it right, but it is a constant struggle lately...... Growing is in my blood, so far Ive been able to get great returns on most of my grows in all of the different states Ive grown, but where im at presently is by far the hardest to control, I do love a challenge, just gets frustrating sometimes....good luck with your grow,, been following a lot of grows and loving them all.....