I live in southern Isle of Wight County. I have approximately one acre of lawn on a very sandy soil. My problem is that I have a major growth of sand burs covering the entire lawn. If you are referring to the summer annual grass that has spiny burs and is commonly found in sandy soil, you need to control it with a pre-emergence through application of crabgrass preventor, says Jeffrey Derr, weed specialist at Virginia Tech's Hampton Roads Agriculture Research and Extension Center in Virginia Beach. It is harder to control emerged sand burs than it is to control emerged crabgrass in turf.
Sand burs are annuals that reproduce by seed.
You also can spot treat sand burs with an herbicidal soap such as Superfast or Scythe or use Roundup or Finale. I have acreage in Isle of Wight and have a well. I want to use organic weed controls, especially on wild onions. Organic controls for wild onion and perennial broadleaved weeds include cultivation and hand weeding in gardens and beds. Remove as much of the root system as possible since certain perennials can regrow from underground tubers or rhizomes, says Jeffrey Derr, weed specialist for Virginia Tech.