The ph value denotes the acidity of a substance and tells to what extent it is acidic or alkaline. The ph value 7.00 is neutral, lower is acidic and higher is alkaline.

The correct pH value of the substrate and the watering water is one of the main factors for a high-yield harvest. Only when the pH is right can the plants also optimally absorb all the nutrients they need and develop well. If you grow the plants in a hydroponic system, the pH value should be 5.5-6.0 . This is how the hemp plant can absorb the most nutrients. Strong deviations of this pH value result in the plant not receiving vital nutrients properly and developing worse.
If you irrigate on soil with a pH of 5.5, this is 10 times more acidic than with a pH of 6.5! A pH value below 6.0 can promote and trigger a calcium deficiency, which in turn manifests itself in burnt root tips and black spots on the leaves. A pH-value above 7.0 causes an iron deficiency, which manifests itself in yellowed/bleached leaves and yellowed leaf veins. The absorption of all the vital nutrients that the cannabis plant needs can be seriously damaged by an incorrect pH level. Fertilising a plant that already suffers from an incorrect pH usually increases the problems even more.

The ideal pH value for substrates and the watering water of cannabis plants is generally 6.0.

ph-value for cannabis

The best results can be achieved with a pH value of 6.0. In this range, the nutrients are water-soluble and can be ideally absorbed by the plant instead of being deposited uselessly in the soil. If the pH value deviates from 6.0, nutrients are no longer as soluble and are therefore less available to the plant.

The pH value of the plant substrate in which the plants are located is important. Special cannabis soil (e.g. from Plagron or BioBizz ) already has the right adjusted pH value and is therefore more recommended for cultivation than an ordinary, albeit high-quality, plant soil from the hardware store. The pH value of the soil should be checked regularly. Test kits which provide exact values in a few minutes.

Especially with hydroponic systems, the grower has to pay more attention to the pH value, because unlike soil, this medium does not have its own regulating "buffer" like soil with microorganisms and a unique soil flora.

-> Conclusion: one way to get the right pH and ultimately optimal grow results is to use cannabis soil.

On the other hand, the pH value of the irrigation water should be measured first and then adjusted if necessary:

Measuring the pH value in the irrigation water

pH meter

To measure the pH value of the irrigation water, you can use the GHE test kit, which is inexpensive, or you can use a pH meter, which shows the pH value even more precisely and is even easier to use. With both methods, the pH value of the irrigation water can be determined quickly and without prior knowledge. With the GHE test kit you can read the value with the help of the enclosed colour scale. Professional pH-value measuring instruments are available in different price ranges and measure the pH value much more accurately. There are also Combined instrumentsthat measure pH and EC simultaneously. You can find out more about the correct use of a digital pH meter in our report pH meters, correct measurement, calibration and maintenance

regulate ph-value

If the pH value of the watering water is not 6.0, it must be adjusted accordingly. There are special additives for this pH-Up and pH-DownThe pH of the water can be adjusted by adding a few drops or a few salt crystals. When these additives have been added, the pH value of the water must be measured again and, if necessary, further adjusted. When adjusting, it is advisable to first dose drop by drop and as described by the manufacturer.

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