It seems they just encourage them to bloom, set seed and then die. My lawn doesn’t need anymore dandelion seeds floating about! Looking for alternatives, I recently read that boiling water will kill dandelions. The first time it will kill the tops and then should be poured on the weed again to get the roots. Vinegar is another option and I’ve seen mixed results online. The best information is from the University of Maryland Exension. If you plan to try using vinegar, you should read their vinegar and weed control solution first.
Thanks for writing