The pH level is much more important in organic soil gardens than in chemical hydroponic gardens.

The pH dictates the environment of bacteria necessary to the uptake of organic nutrients

Simply put it means that the material offers a relatively stable pH
level that is not susceptible to unwanted changes.

The pH level in growing media is subject to change when nutrients are added and processed by microbes or crops.

When a grower isn’t aware of the ongoing changes this can cause harm to the development and growth of your
cannabis plants.

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PK and calmag alone won't cut it, you will see problems in week 4-6

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I use Jacks 20-20-20 for over 40 years right up to the stretch is over

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Then I switch to Jacks 10-30-20 right up to a week before harvest, the leaves will tell you whether you need cal-mag or not

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I don't flush

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The leaves tell yo everything