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Pest Information

Roughstalk Bluegrass

Roughstalk Bluegrass

  • Latin Name: Poa Trivialis
  • Common Name: Roughstalk Bluegrass
  • Other Names: Rough bluegrass

Pest Details

Roughstalk Bluegrass
Roughstalk Bluegrass
Roughstalk Bluegrass


Introduced from Europe as a forage grass, and present throughout much of North America to Alaska. It also is used occasionally for turf in wet habitats, but does not tolerate dry conditions and thus is limited in its use as a turf grass.


Similar in appearance to Kentucky Bluegrass, but this species does not have rhizomes. It is a perennial grass that reproduces from seeds, but also spreads by stolons that will form roots at the nodes. In fine turf settings it often is a contaminant, and also occurs as a weed in orchards, along roadsides, and in any disturbed moist habitat.


Mature plants grow to a height of 3 or 4 feet when not disturbed, with stems that may be erect or reclining. Many stems arise from the base of the plant, forming thick clumps. Leaves are flat and have a rough texture, and may be up to 10 inches long. A papery ligule is present at the base of the leaf. The seed heads are an open panicle or cluster of branches off the central stem. Each branchlet contains numerous seed spikelets, each composed of 2 to 3 flowers.

Characteristicts Important to Control:

Where this grass grows as a contaminant in other turf grasses it must be physically removed, and the use of a pre-emergent will help to prevent germination of the seeds.

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