Pull dandelions by hand, making sure to get all of the thick root. Wild garlic is difficult to control by hand. In order to eliminate it, you must pull up all the tiny bulbs in the soil. Probably the best hand remedy for a severe infestation of this weed is to solarize the soil for a full season, then start the lawn all over again. If you prefer a chemical control, use a selective herbicide containing dicamba.
Chemical control is only partly effective against wild garlic, even with repeated sprayings.
Chemical control with herbicides may be necessary if you have a large lawn or a lot of weeds. Pre-emergent herbicides prevent weeds from germinating by creating a barrier of gas in the top few inches of soil that weed seeds can't penetrate. After applying a pre-emergent herbicide, you'll need to water in order to activate the gas. Post-emergent herbicides kill weeds after they have germinated. Round-Up and Finale are examples of common nonselective herbicides.