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pH tolerance

The plants' pH-value requirements have only been stated for plants for which this is of great importance to growth.
Acid pH = 5 - 6.5
Neutral pH = 6.5 - 7.5
Basic pH = 7.5 - 9
It is often the water hardness in connection with the pH value which is of importance. A coming page on water chemistry will contain more information about this.