Cement is a fine, soft, powdery-type substance. It is made from a mixture of elements that are found in natural materials such as limestone, clay, sand and/or shale. When cement is mixed with water, it can bind sand and gravel into a hard, solid mass called concrete.
Overview. While onions may be welcome in your vegetable garden, they are considered weeds in your lawn. Onion grass, a type of wild onion, often flourishes in yards, particularly in the southeastern region of the U.S. Like most common lawn weeds, onion grass can be eliminated with commercial herbicides and weed killers.tep 2. Cut onion grass very short to prevent flowering. Onion grass reproduces by flowering and seeding. By cutting onion grass to the same height as your lawn grass, you can stop it from spreading.
1 Remove dead crabgrass plants. 2  Replant bare lawn spots with new grass seed. 3  Apply a crabgrass preventer at the appropriate times. 4  Set your lawnmower at the high end of the range that is best for your grass type.. Remove Dead Crabgrass Plants. Getting rid of crab grass plants after they die is just as important as killing the weed. The dense mat that crabgrass forms can smother nearby grass plants. Removing the dead plant in a timely manner may allow your lawn grass to recover.