Over the past few years, we have induced nutritional disorders on several species. These controlled experiments have allowed us to view unique symptomology on plants. In greenhouse production, observing common problems on geraniums is fairly routine, such as low pH, high pH, nitrogen deficiency, and magnesium deficiency. Rarer to appear are some of the micronutrient deficiencies.
On a recent extension trip, we inspected some geranium plants with unique leaf
symptomology. The young leaves had pronounced veination. The small veins
popped out. The more typical high pH-induced iron deficiency symptoms result in wider bands of chlorotic tissue between the green veins.
Confirming a Mn deficiency diagnosis with leaf tissue analysis is required for this rare event.
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