Athosanswered grow question 5 years ago Is it a uniform yellowing? if so then try giving them a little of veg nutes. Quite normal during the stretch. If the yellowing is more pronounced on the tip and the base is still green and the edges of the leaves are rusted / burnt, then it is potassium deficiency and you should up the bloom nute. The stretch can be quite demanding in the feeding departament, 1.4 EC is quite mild, so don't be afraid to up it some more.