When dandelions infest your lawn, your best natural remedy for killing the invasive weeds can be found in your kitchen cupboards--vinegar. The high acid content in vinegar kills dandelion weeds on contact, without polluting the soil or harming pets or humans. In addition to dandelions, common household vinegar kills foxtail, thistles, pigweed and velvetleaf weeds. Make a homemade, all-natural dandelion weed killer spray and watch them disappear from your lawn or garden.
Pour 1 gallon of household vinegar into a large container. Add 1 ounce of liquid dish soap. Mix the ingredients together gently so you don't create any bubbles from the dish soap.
Clean the pump sprayer to remove any residue from fertilizers, herbicides, insecticides or fungicides before using it for the natural dandelion weed killer.
Pour the vinegar mixture into the clean pump sprayer.
Spray the vinegar solution directly onto the dandelion flower heads and leaves using the pump sprayer.
Wait 24 to 48 hours, and check if the dandelion weeds are turning brown, wilting and dying. Repeat the vinegar application if you don't see the dandelions dying back within two days.