Microstegium vimineum
grassy weedUSDA zones 5–9Active: summerInvasive summer annual that thrives in shade and moist conditions. Spreading rapidly across the eastern US, displacing native plants.
Pale silvery stripe along midrib of lance-shaped leaves; delicate, bamboo-like appearance; sprawling, branching stems.
Mow or string-trim in late August before seeds mature. This annual depends on reseeding.
When: Mow in late August/early September before seed maturity
Thick turf resists stiltgrass invasion. Fertilize and overseed shaded areas.
When: Fall overseeding with shade-tolerant species
Shallow-rooted and easy to pull. Remove before seed set in September.
When: Pull in July-August before seeds mature
Spring pre-emergent prevents stiltgrass germination.
When: Apply in early spring when soil reaches 55F (soil ≥ 55°F)
Active ingredient: Prodiamine — e.g. Barricade
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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