Prevent Dandelions - Lawn Problems (and How to Fix Them) - Bob Vila
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These cheerful but malevolent weeds are lured by too much lawn traffic and too little calcium. Prevent dandelions by de-thatching and aerating your lawn annually. If any dandelions still manage to sneak through, spray them directly with diluted vinegar (an organic alternative to weed killer). Don't forget to have your soil tested, as it may be necessary to augment your soil with calcium to correct a chemical imbalance.