solid7 said:
Definitely not too late. And if the growth of your plant stalls for too long, it will only be a matter of time before they begin their failure mode. You will want to see some new growth very soon, or it's a cause for concern.
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Keep that mix recommendation on hand, as backup, in case you see a decline, and need to switch course. (it might not even hurt to repot one plant, just as a baseline)
I'm definitely doing your mix next year! I have 25 grow bags of which 24 have peppers in them, the earliest were put out early May. I also have 18 in a kratky setup and they have all grown significantly in the last few weeks. Since I see the hydro plants every day, they get more attention than the containers which are in the back. The containers actually get better sun but the hydros have doubled or tripled in size. I need to take some photos to really see how the container plants have grown. Compared to the hydros they seem stationary but they may have grown but I just don't notice it.