What is crabgrass and why is it so difficult to get rid of? Crabgrass is a low-growing weed that can produce many stems, resembling the legs you would see on a crab growing horizontally. Crabgrass, scientifically known as Digitaria, is a persistent and unwelcome intruder that can quickly take over commercial properties, undermining the aesthetics and health of lawns and landscapes. Its rapid growth, resilience, and ability to spread easily make it a challenging weed to control. It is important to know the characteristics of crabgrass, understand its life cycle, and explore effective strategies to prevent its invasion and keep your commercial properties free from this troublesome plant.