ph too low!!

cocoman

Member
hey last time i posted i got great feedback which helped a lot so thanks and here goes again.
i am groing sativa strain jack herer
i use gh nutes in pure coco and ph the mix at 6.0 and have been doing this throughout the entire grow and they seem to like it. at week 3 i ph tested the runout water and it was 5.8-6.0 as well like the mix

they are now into week 5-6 of flowering and while they are all budding and showing clusters some of them are doing much better than others. ie. secondary buds bigger than top nugs on other plants!
so i go to check the ph of the runout, after giving my usual 6.0 ph feeding, and the ph ranges from 4.9-5.3.

i have given just water (no nutes) for the past 3 feedings about 48 hours, and see little improvement in the ph 5.2-5.4...
but the pants still seem stunted in growth, and i would like to see the ph at 5.8 to 6.0. this is concerning since there are only 2 at most 3 weeks left before cut! what to do? keep giving pure water with little nutes? i did a test with one sucker and put a ph of 12.0 in the water by using ph up to raise it. seconds after phing the water 12 i water the plant, then the runout comes out 5.3!!! i don't get it any help is appreciated thanks
 
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