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.
Step 5. Spray any patches of grass or weeds that you see with a 50 percent bleach and 50 percent water solution. Three squirts near the base of the grass and weeds is enough to kill them. Bleach will kill any type of plant. Be careful that you do not get it on any of your vegetables.