Also known as Creeping Signalgrass or Tropical Signalgrass, This summer annual is similar in growth and spread to Crabgrass. In fact, it is often mistaken for Crabgrass. Although classified as a summer-annual, this weed often perennializes (doesn’t die off seasonally) and continues to thrive year-round. Left unchecked, Alexandergrass quickly chokes out lawns.
Currently, there are no selective herbicides that will kill Alexandergrass growing in St. Augustinegrass and Bahiagrasss lawns. Management options are available for Alexandergrass growing in Zoysiagrass, Bermudagrass, and Seashore Paspalum. Baking soda can be used to “burn off” Alexandergrass growing in the lawn with minimal damage to the lawn.