Echinochloa crus-galli
grassy weedUSDA zones 3–10Active: summerCoarse summer annual that grows vigorously in moist, fertile areas. Can grow 3-4 feet tall and produces large, purplish seed heads.
No ligule (key identifier); wide, coarse blades; purplish-red seed heads; grows in clumps; often in moist low spots.
Barnyardgrass invades thin, moist areas. Improve drainage and turf density.
When: Overseed thin areas; improve drainage
Pull young plants including roots before seed heads form.
When: Pull in early summer
Spring pre-emergent prevents barnyardgrass germination.
When: Apply when soil temperature reaches 55F (soil ≥ 55°F)
Active ingredient: Prodiamine — e.g. Barricade
Controls young barnyardgrass plants.
When: Apply to young plants before tillering
Active ingredient: Quinclorac — e.g. Drive XLR8
Grass safety: always match herbicides to your grass species — products safe on Kentucky bluegrass can kill St. Augustine or centipede. Lawn Guardian checks this automatically against your lawn profile.
Lawn Guardian turns this guidance into a schedule timed to your USDA zone and this week's actual weather — and adapts every time you log what you've done.
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