Looks like your plant is getting plenty of Nitrogen from the soil but not enough phosphorous.
For all organic, I am using both fungus and bacteria.
I like yogurt bacteria in later stage to improve aroma and potency. Milk also have good nitrogen and a bit of phosphate. And yogurt bacteria reduces pH a little bit.
I like fungi for other uses. Mycorrhiza helps plant hunts for phosphate and other nutrients. It is too late for this grow. Mycorrhiza should be use at germination and seedling phase.
Try fish tea or very small amount of bone meal. Look for phosphorous in the label.
Mixing manure and guano in water before feeding also reduces pH. In dark green leaves case, stay away from sea bird guano. These are high nitrogen. Do look for fruit bat guano from cave. They have higher K and P. Avoid the K only guano.
For me, I use high dose of earth worm casting in my during the start. And these days, I don't bother with pH anymore.
Organic growers are my hero.
Alright mate, noticed what you said about the vinegar. I was using lemon juice for ph down and I started getting leaf issues, I needed 10 ml lemon juice in 4 ltrs of water to get my ph down to 6.5 so maybe have a google about the vinegar you're using, see if it's gonna cause an issue, Atb
@Cudeech, I only mention it as after a quick google there were mixed responses for vinegar. I used lemon juice and started getting issues and someone pointed out it would most likely be that, I forget why, but when I stopped and bought ph down my problem went away. I really wish I could remember why, I did find this on google though
"Yes, adding lemon juice to water will lower pH. However, doing so may harm your plants in a hydroponic or traditional gardening system. Remember that lemon juice acts as an antimicrobial agent, which means that it kills bacteria and fungi." That doesn't apply to you obvs
This may interest ya
"pH down is primarily phosphoric acid, which is the most stable and least harmful to your plants"
Take a look at citric acid, some mention of it here
https://www.thcfarmer.com/threads/negative-effects-of-vinegar-for-ph-down.115142/
If you use ph down you wouldn't be able to say you've done a 'fully organic grow' but it's up to you. Best bet mate is try vinegar and look for issues arising after a week or 2s use, if it doesn't work at least you'll know and you'll have seen it for yourself, learnin from mistakes is often the best way to learn.
@@Mr_Cannab1sir, interesting. this being my first indoor grow, i had no idea of any negatives. i am trying for an all organic grow, living soil, water only. i have the chemical type PH up and down, but was afraid to use it since i read it could kill soil bacteria.