Digitaria ischaemum

Smooth Crabgrass is a
low, spreading grass
which is common in fields,
waste areas, and lawns. This grass is light green
in color when young, with parts turning reddish-purple as it
ages. Smooth Crabgrass grows as
a rosette,
meaning it is rooted in the center with leaves and stems
spreading outwards. Leaves grow one to three inches
long. An older plant can grow
up to about 15 inches tall, but usually they are much
shorter. Smooth Crabgrass was
introduced
in America from Europe. Virginia Tech Smooth Crabgrass
flowers
are tiny and have no petals. They grow on spikes rising
straight up from the plant. Flowers bloom from July
to October. The seeds
of crabgrass are eaten by many animals, including Mourning
Dove, Northern Bobwhite, Wild Turkey, Brown-headed Cowbird,
Dark-eyed Junco, and sparrows. Eastern Cottontails eat the
leaves.


Virginia
Tech

Smooth Crabgrass is an annual, which means it dies after one year. Each summer, many crabgrass plants in the same area will spread together to make a mat.
While it will compete with, and choke out, other grasses, Smooth Crabgrass often grows alongside other "weed" plants, such as clover and plantain.
Animals that eat crabgrass seeds help spread the plant by pooping the seeds out in new places.
Relationships in Nature:
Animals
Using as Food Source Animals
Using as Shelter Associations
With Other Plants Dark-eyed Junco Dark-eyed Junco D
Relationship to Humans:
Most people who garden or care for lawns despise Smooth Crabgrass. It takes over from other grasses which are more desirable in lawns. It hardly ever gets mowed, because usually most of the plant is below the lawnmower blade. Along with dandelions, this is probably the most common weed pulled from gardens. On the other hand, Smooth Crabgrass will often grow in places where no other plants will grow, making them green and lush, as well as attracting wildlife.