How to Kill Weeds
To kill weeds, try pouring boiling water over them. Or, you can spray white vinegar and water on the weeds to kill them. Alternatively, you can make an organic weed killer by mixing vodka, water, and dish soap. If organic methods aren't cutting it, you may want to use a chemical herbicide to kill the weeds, but keep in mind that they can be dangerous to use, and they might kill your grass and other plants.
Determine the ideal height of your grass. All lawns have an ideal grass height that promotes healthy growth. Depending on climate and geography, your ideal grass height is between 1/4 inch (0.635 cm) and 3 inches (7.62 cm). Talk to a landscaping expert or a professional at your local home and garden retailer to get an understanding of the type of grass you have and how high it should grow. Keep grass a little bit longer when in doubt. This will provide shade to your lawn, depriving potential weeds of sunlight. Mow your lawn as regularly as necessary to keep grass at its ideal height. This will eliminate weed heads before they are allowed to mature or germinate in your lawn. Use a weed whacker or a trimmer on the weeds that grow at the edge of your lawn every time you mow. Spread stones or mulch around your flower beds to prevent weeds from growing. The cover will keep the ground cool and deprived of sunlight, discouraging the growth of new weeds. Identify and find herbicides for the weeds in your lawn. Select a broad leaf herbicide that matches your weeds. This type of herbicide is useful for eliminating clover , dandelions and ragweed. If the weed you want killed is not on the label, don't buy it. Watch for child and pet warnings! READ and FOLLOW ALL DIRECTIONS on the container. Apply the herbicide with whatever applicator it comes with. Products are frequently supplied with spray bottles so you can apply them directly to the weeds. Make sure it's not windy or you can end up killing plants you wanted or were going to eat. Treat entire patches of weeds and spot-kill the few isolated weeds that sprout up around the yard.  Attach a sprayer to your garden hose if you have an entire lawn of weeds that are out of control or have not received any attention for a long time. This will allow you to efficiently apply a large amount of chemical weed killer to the whole lawn. Remove any toys, furniture, pets or clothing before you spray. The chemicals can be dangerous to people and animals. Create a buffer between soil and your garden. This can be done with newspaper or an old shower curtain. Lay the paper or curtain down on the grown and cover it with mulch, pebbles or dirt and plant your flowers. Weeds will be unable to take root or move past the buffer. Spread corn gluten meal in your plants or on your lawn. Corn gluten meal prevents germination of weed seeds but it will not bother your established plants. Best used in early spring. Pour boiling water on any weeds or patches of weeds you see in your grass. This is especially useful on weeds you notice in your driveway or walkway, because the water will have an easy time running off without bothering your plants or grass. Spray a combination of vinegar and water on patches of leaves. Do not do this too close to plants or flowers, or cover them up before you spray. Vinegar will kill good growth as well as weeds. Mix 1 oz. (28.34 g) of vodka with 2 cups (473 ml) of water and add a drop of dish soap. Spray this mixture on the weeds and watch them dry up. 
Determine the ideal height of your grass. Mow your lawn as regularly as necessary to keep grass at its ideal height. Spread stones or mulch around your flower beds to prevent weeds from growing. Identify and find herbicides for the weeds in your lawn. Apply the herbicide with whatever applicator it comes with. Treat entire patches of weeds and spot-kill the few isolated weeds that sprout up around the yard. Attach a sprayer to your garden hose if you have an entire lawn of weeds that are out of control or have not received any attention for a long time. Create a buffer between soil and your garden. Spread corn gluten meal in your plants or on your lawn. Pour boiling water on any weeds or patches of weeds you see in your grass. Spray a combination of vinegar and water on patches of leaves. Mix 1 oz. 