If all the leaves have turned a very faint green/yellow??

I have added N and also have been giving very mild amount of BioBizz Bloom. They are 28 days into flowering.

On two of my 3 plants the leaves have faded to yellow all over. the reason i am sure is that these two had shite soil (it has gone hard and no alot of drainage happening)

ive tried everything and they are actully budding really nice. will this kill them????????

could b nutrient lockout or a pot bound plant

i had a bad yellowing problem about a week ago. turns out they were rootbound. i transplanted to bigger pots, and fed some flower nutes. only have a few leaves still yellow. it is mostly recovered. so when ur roots get dry, take out the rootball and check it

could need some nitrogen. I usually give em a N boost during weeks 4&5 on a 9 week strain.

will what kill what?
what exactly r u asking?
post some pics...