This can be determined by looking at the Guaranteed Analysis on the fertilizer label. Nitrogen sources will be listed first under the Guaranteed Analysis. While it does not contain any urea nitrogen, it is 100 percent water soluble and provides the proper balance of primary and secondary nutrients. For Miniature Violets, you may want to try Optimara Miniature Plant Food. This urea-free fertilizer has a slightly different formulation to accommodate the specific needs of miniatures.
Prevention Never use fertilizers which contain urea nitrogen.
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