Poa trivialis

Cool-season perennial grass

Active growth during spring and fall, tends to go dormant, and may turn brown during hot summer months

2–6 hours of sun daily

Germinates best when soil temperatures are below 70°F (21°C)

Prefers moist, well-draining nutrient-rich soils

3–7 (USDA)

7 to 14 days under optimal conditions.

Approximately 6.0 to 7.0

Requires consistent moisture and may struggle during droughts

Apply balanced fertilizers to maintain nutrient-rich soil conditions

Spreads via stolons (above-ground runners), forming dense, mat-like patches

6–12 inches (if left unmowed); typically mowed to 2–3 inches in lawns

Aggressively spreads through stolons, covering ground rapidly

For turf applications, sow at 1 to 2 pounds per 1,000 square feet for even coverage

Produces inconspicuous flower spikes primarily in late spring to early summer

Food plant for caterpillars, butterflies, sun beetles

Shade lawns, overseeding for winter color, erosion control, ornamental use in moist areas

Not commonly mixed with other grass species due to its aggressive growth habit

Requires regular mowing to maintain desired height, typically kept at 2 to 3 inches for general turf areas

Non-toxic to humans and pets

Generally not prone to significant pest issues, maintaining healthy turf can prevent potential problems

Susceptible to diseases like brown patch and dollar spot, especially under humid conditions

Despite its name, Rough Bluegrass has a fine texture and a light green color, which creates a patchy appearance in lawns when mixed with darker green grass species

While Rough Bluegrass can be useful in specific applications, such as shaded, moist areas, it is often considered undesirable in home lawns due to its tendency to become dormant during heat and its patchy growth habit. 

Proper lawn management practices, including appropriate irrigation and mowing, can help manage its presence.