Often, an excess of one element will cause a deficiency in one or more other elements, and vice versa. Short of sending your plant to a laboratory for testing, you will probably have to be satisfied with simply knowing that your African Violet suffers a nutritional imbalance without knowing the exact elements involved. This said, do not be discouraged. Other Symptoms Leaves pale . Leaves pale on the edge .
Edges appear yellow in color.
Plant growth is slow . If you suspect that your Violet is suffering from Phosphorus Deficiency, the best treatment is to simply change fertilizers. If you are not using one, start now. For Miniature Violets, look for a fertilizer that has somewhat lower percentages, such as Optimara Miniature Plant Food. In addition, repot your African Violets at least twice a year.