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.
Plant onion sets, or dormant bulbs, 1-Â½ to 2-Â½ inches deep in a location with full sun. Onions require well-drained soil high in organic matter and consistent moisture. Plant onion sets in rows in a location with full sun. Space the sets 3 to 4 inches apart in rows. Leave a space of 12 to 15 inches between rows. Harvest every other plant after a month and a half to use as scallions, also known as green onions. Space rows 12 to 15 inches apart and harvest scallions after a month.