Problem: Sandbur (Lawns)
Cenchrus species Sandbur, also called burgrass or sand-burgrass, is an annual grass that grows 6 inches to 2 feet tall. The narrow, yellow green leaf blades are 1/4 inch wide, 2 to 5 inches long, and may be rough on the upper surface. The blades are attached to flattened stems that may grow upright or spread along the soil. Plants have shallow, fibrous roots, and when growing in mowed lawns, they form low mats. From July to September, seeds are produced inside the spiny, 1/2-inch, straw-colored burs that are formed on the stems. Each bur contains only two seeds, but one plant may produce as many as a thousand seeds. Seeds are spread to new areas when the burs cling to clothing and animals. The seeds germinate in the spring. Sandbur is most troublesome in lawns with light, sandy, soils.
Plants can be removed by hand if handled carefully with gloves. Sandbur can be crowded out by healthy grass. For a thick lawn, follow proper feeding, watering, and mowing practices. Sandbur does not usually invade lawns of St. Augustinegrass, which shades the weed out.