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MANGANESE (Mn)The plant also uses this in its enzymes. Deficiencies and overdoses are both unknown when growing on soil. A lack might occur when growing on rockwool because of a too high pH. This is recognized by a yellowing between the veins of the new leaves (but not the very newest). COPPER (Cu) Copper deficiencies are extremely rare. Be careful not to confuse this deficiency with the symptoms of overfertilisation that are common if you use to much with white widow feminized.