Which cool-season perennial spreads by long white rhizomes, has leaf blades about twice the width of bluegrass, and features an auricle that clasps the stem and a hairy lower leaf sheath?

Which cool-season perennial spreads by long white rhizomes, has leaf blades about twice the width of bluegrass, and features an auricle that clasps the stem and a hairy lower leaf sheath?

• A. Quackgrass, Also Known as Crouchgrass
• B. Nimblewill
• C. Knotweed, Prostrate
• D. Puncturevine

Answer: (A)

The features described point to quackgrass. It’s a cool-season perennial that spreads primarily through long white underground rhizomes, enabling it to form colonies far from the source plant. Its leaf blades are relatively wide—about twice as wide as bluegrass—giving a distinct broad-leaf look in a turf stand. The leaf base has an auricle that clasps the stem, a telltale sign of this species, and the lower leaf sheath is hairy. These combined characteristics are classic identifiers for quackgrass (couchgrass). Nimblewill is a warm-season grass that spreads differently, knotweed prostrate is not a grass, and puncturevine is not a grass at all, so they don’t fit the described traits.

The features described point to quackgrass. It’s a cool-season perennial that spreads primarily through long white underground rhizomes, enabling it to form colonies far from the source plant. Its leaf blades are relatively wide—about twice as wide as bluegrass—giving a distinct broad-leaf look in a turf stand. The leaf base has an auricle that clasps the stem, a telltale sign of this species, and the lower leaf sheath is hairy. These combined characteristics are classic identifiers for quackgrass (couchgrass). Nimblewill is a warm-season grass that spreads differently, knotweed prostrate is not a grass, and puncturevine is not a grass at all, so they don’t fit the described traits.