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Iron deficiency

Iron deficiency typically causes the leaves to become mottled yellow where the veins of the leaf remain green.  This type of deficiency is sometimes associated with manganese deficiency.  Iron deficiency usually affects the youngest, uppermost leaves first. Often a problem for ericaceous (acid-loving) plants in higher  pH (more alkaline soils).

Feed deficient plants with an ericaceous plant food.  In hard water areas try to always water  ericaceous (acid-loving) plants with rainwater.