According to American-Lawns.com, there are three types of lawn weeds: the grassy type, the grass-like and broad-leafed weeds. Weeds can be controlled with chemicals that prevent the weeds from developing. Other treatments destroy the weeds once they have begun to develop.
Ragweed is a common weed throughout the United States, well known for causing allergies in many people. According to Landscape-America, one ragweed plant can produce up to 1 billion pollen grains. The blooming period for ragweed is generally from mid-August to mid-September. Ragweed grows best in sunny locations and can usually be found along the edges of fields and lawns.
Mushrooms grow in decaying wood underneath the grass. Usually there is nothing you can do to get rid of mushrooms unless you dig up the organic material causing the mushrooms to grow. The mushrooms will not hurt your lawn, though they may not be pleasant to look at. Some mushrooms can be eaten, but others are toxic; never eat mushrooms that grow in your yard unless you are certain you know how to identify them. To get rid of mushrooms quickly, pull them up immediately after they begin to grow.
Clover usually begins to grow in lawns in early spring and produces white, puffy flowers. The weed will go into dormancy during droughts and in the fall. This leaves brown patches in the lawn that look like areas where the grass has died. Over time, the clover will spread to larger areas and can take over a lawn. Spray the weed with a herbicide such as triclopyr in the fall. Reseed or sod the area in the spring.
Ground ivy is a low-lying, flowering weed that attaches itself to the ground. It can spread very quickly and is extremely hard to control. Unlike most weeds, ground ivy does not respond to herbicides that have been sprayed to prevent weeds. You must treat the ivy after it has emerged. It often acts like a vine because it spreads with creeping stems. Ground ivy is best controlled during the spring when it first begins to flower. Spray two applications of herbicide approximately 1 month apart to eliminate the weed in your yard.