Nitrogen is an essential element for the growth and vitality of African Violets. It is important for overall growth and the development of green leaves and stems. The most common cause of Nitrogen Deficiency is either a lack of available nitrogen in the soil or a pH imbalance in the soil which inhibits the absorption of all nutrients. Distinguishing Symptoms Leaves pale on the edge .
Edges appear yellow in color.
If your African Violet exhibits this symptom, there is a good chance that it is suffering from a Nitrogen Deficiency. While you may never know for sure whether your plant suffers from a pH imbalance, Nitrogen Deficiency or other lack of nutrients, you should have a good idea whether your plant has suffered shock or some form of physical trauma. Generally, the symptoms of shock will begin to appear within 36 hours. Shock may occur due to sudden changes in air or water temperature, repotting or trauma, i.e., dropping or shaking the plant. Due to the complex interaction between plant nutrients, it is often very difficult to pinpoint the precise element causing problems.