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 4. Spray a strong herbicide in the soil where the onion grass was. Look for a herbicide that contains imazaquin, metsulfuron methyl or glyphosate. Do not let the herbicide make contact with the rest of your lawn.tep 5. Continue using herbicide treatments until the onion grass has stopped growing. Spray the area well in late winter/early spring--when the onion grass starts to grow but the lawn is still dormant--and in late fall to prevent the weed from growing the next year.