PH Fluctuations

Leaf Colour:
Veins of Leaves Stay Green
Brown or Dark Spots

Leaf Symptoms:
Lower Leaves / Older Growth Affected
Veins of Leaves Stay Green
Spots
Mottling / Mosaic
Spots on Leaves?: Yes

Quick Summary: Managing pH is crucial for cannabis plants to be able to take up nutrients through their roots. When the pH around the roots jumps up and down, it can stress the plant and cause brown spots to appear on the leaves. Spotting on the leaves as a results of pH fluctuations is more common in hydroponic setups (where the pH tends to go up and down), but it is possible it can also happen in soil. This seems to often happen when the pH swings too high.

Problem: Certain leaves on the middle or lower parts of the plant show tan or brown spotting

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