Originally Posted by slownickel
Organics or not has little to do with pH. If the mix is very loose, you need a lower pH. If it is more of a soil, no problem with a pH of 7.
Moving pH up and down is a good idea and should be practiced most definitely BUT with lots of care. If the soil is a loose mix, that high a pH will lock the most important elements out.
Not that a higher pH doesn't work, lots of things WORK. I am talking about if you want higher oil content and active ingredients where one can get consumer pull from the WOW effect.
PH is always important, however it changes with the medium and grow style.
If you have a thriving micro-herd, then the pH should be 7.0, because that is best for bacteria.
Many 'organic' grows are just using heavily chelated liquid organic nutrients, which aren't that different fom synthetic nutrients.
Anyway, early on in the grow you need uptake of NPK and Mg, and that happens at a higher pH. They are also mobile nutrients, so when a mobile nutrient deficiency presents itself, pH is one of the first things to look at.
And you can always lower the pH at the end of the grow for better non-mobile trace element uptake.