Without taking a live sample of the roots and examining them under a microscope, you will not know with certainty that your African Violet is suffering from Root Burn. However, if you have ruled out other causes and have verified that your fertilizer contains urea nitrogen , then the likelihood is considerable that Root Burn is the problem. Other Symptoms Leaves pale . They appear yellow in color. Not flowering .
Plant growth is slow .
Treatment First, drench the soil with lukewarm water and let drain. This will help leach out any of the urea nitrogen that is causing Root Burn. Next, switch to a Violet Food that does not contain urea nitrogen. This can be determined by looking at the Guaranteed Analysis on the fertilizer label. Nitrogen sources will be listed first under the Guaranteed Analysis.