Yard Doctor

Smooth crabgrass (Digitaria ischaemum)

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Posted in Weeds

Smooth crabgrass (Digitaria ischaemum)   What does it look like?

The enemy of barefoot walks across your lawn, smooth crabgrass is a warm-season, annual grass weed. It is light green and has a prostrate growth pattern.

When, where, and how does it grow?

Smooth crabgrass is a wide-spread summer weed. It starts to grow in the spring, when soil temperatures reach 55°-58°F for 4-5 consecutive days. It's also tenacious, returning each year to identical locations after leaving a prolific seedbed in the soil.

How can we get rid of it?

Nothing foils crabgrass like a dense lawn, which keeps out the light this weed needs to germinate in the first place. Proper lawn care is therefore essential! The best way to control crabgrass is to apply herbicide in the spring, before soil temperatures become ideal for growth. If crabgrass has already started growing, a different variety of herbicide designed for mature plants is needed. Eliminating mature plants in the late summer is very difficult, but they will die with the first frost.