The following charts show you how easy it is for the plant to absorb each nutrient at different pH levels. This can give you something to aim for when you notice a specific nutrient deficiency.
Soil ~ 6.0 – 7.0 pH
In the wild, cannabis prefers a slightly acidic soil environment. For soil an optimum root zone pH for cannabis is between 6.0 and 7.0, with the most time spent with a pH between 6.2 – 6.9. It’s a good idea to let the pH cover a range instead of always adjusting to the exact same pH number.
See which nutrients are best absorbed at which pH levels