Problem or not

Temps are not the problem, reducing the nitrogen too early has caused this, but it is ok, the plant is taking what it needs to feed itself from the older leaves, which causes the yellowing and shows how important it is to not defoliate your plants. If these plants had been defoliated, there would have been no source of nutrition at all, resulting in flowers half to a quarter of the size that they are now. Giving them a half dose of "grow" nutrients now will help them to finish more healthily and not detract from their quality or cause any other type of issue. Hope this helps, .............. Organoman.