I'm having particular trouble with my Early White Widow as well as my two different White Widow Autoflowers. The plants are doing great untill the side branches start to develop. They clearly needed more P and got it and it helped but then needed more and more until I can't believe any other plant I know of could take it. The yellowing took on a more N deficiency look gave N and at first seemed to help but then a hooking of the tips and wrinkling of texture. So now I think K here are picksView attachment 188687 Yellowing of new growth-under this light it shows bad add P it helps then more and more and more until the amount is insane! At the same time a minor hooking in the tip got worseView attachment 188688 I altered my ph to a bit higher as what I use (Cutting Edge) works by low ph and hi feed that as it runs and the feed is used up the ph also goes up to a better absorption level- but I'm not DWC or recirculate, just dump and drain. Adding ph up can over a very narrow range over feed the plants, so ph change is a very delicate and difficult change when the plant is already in distress but a mild ph up helped too. Now I'm wrinkling and lately I'm Swiss ChardingView attachment 188689 My normal veg grow mix is-- 5cc bloom and 15 to 20 cc grow. I run pre bloom of 15 bloom and 5 grow full bloom is 20 Bloom 0 Grow Right now I'm at 25cc Bloom and 25cc Grow and Audrey Junior still needs more! 50 combind is 100% more than anything I've seen a plant take! Only the White Widow and WW autos. PS my Cal/Mag is at 10cc/gal I use RO water and keep my eye out for carbonate precipitate and endosporagenic lithiatrophic bacilli. I have seven other strains going right now on the Cutting Edge Solutions two are auto strains my experience in soiless is novice.