Is Poa trivialis a good lawn grass?

It is excellent for damp, shady areas but can be invasive in moist or heavily watered lawns, and it thins out in sunny, dry spots.

Improve drainage and reduce shade if you want to discourage its growth.

Plant guide

Roughstalk bluegrass.

Poa trivialis

Pronounced PO-uh triv-ee-AH-liss

Also known as Bird Grass, Rough Meadow-Grass, Rough Stalk Blue Grass, Rough bluegrass, Scribner's Bluegrass

Roughstalk bluegrass is a cool season perennial grass that thrives in damp, shaded areas. It spreads through stolons, which helps it form a dense mat in your lawn or garden. You will often find it popping up in moist meadows or along stream banks.

At a glance

Care level: Easy
Plant type: Perennial grass
Light: Partial shade to full sun
Indoor light: Bright indirect
Water: Every 2 to 5 days
Mature size: 2 to 3 feet
Growth rate: Fast
Hardiness: USDA 4 to 9
Bloom time: Late spring to early summer

Care

Keep the soil consistently moist because this grass does not handle drought well. Watch for yellowing leaves, which often signals that the soil has dried out too much. It prefers cooler temperatures and may struggle during the peak heat of summer.

Watering: Keep the soil damp to the touch at all times.
Feeding: Apply a balanced fertilizer during the active growing season.
Pruning: Mow or trim regularly to maintain a tidy appearance.
Repotting: Divide the clumps if the plant becomes too crowded or root bound.
Soil: Moist, fertile, well draining soil
Soil pH: 6.0 to 7.5
Temperature: -34 to 30°C
Humidity: 60 to 90%
Drought tolerance: Low
Lifespan: Perennial, typically 3 to 5 years.
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the drainage holes.
Stunted growth despite regular watering.

Safety

People: There are no known toxic effects to humans from contact or ingestion.
Children: It is safe for children to play around, though ingestion is not recommended.
Contact allergens: The leaf blades can cause minor skin irritation or cuts if handled roughly.
Airborne allergens: The pollen can trigger seasonal allergies in sensitive individuals.
Edibility: This grass is not intended for human consumption.

How to identify it

Rough texture on leaf sheaths
Bright green leaf blades
Boat shaped leaf tips
Spreading via creeping stolons
Open panicle flower clusters

Height: 0.2 to 0.9m
Spread: 0.15 to 0.45m
Leaves: bright green, deciduous
Flowers: green, purplish, 0.1 to 0.3cm

Problems to watch for

Dollar spot · Small, sunken patches of bleached grass appear during warm, humid weather.

By symptom

Plant problems by symptom

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Growing it

Propagation: seed, division
When to plant: spring, fall
Overwintering: It stays green in mild climates but will go dormant in freezing temperatures. No special protection is needed as it is quite hardy.
In containers: It is not typically grown in containers as it prefers to spread into the ground.

Division

1. Dig up a clump of the grass in early spring.
2. Gently pull the clump apart into smaller sections.
3. Replant the sections in moist soil.

Pair this grass with moisture loving perennials to create a lush, low maintenance ground cover.

Grows well with

Creeping Buttercup · They both thrive in the same moist, shaded soil conditions.

Similar species

Kentucky Bluegrass · It is a close relative but prefers drier, sunnier conditions.

Science

Family: Poaceae
Genus: Poa
Order: Poales
Class: Liliopsida
Native range: Europe, Asia, and North Africa.
Conservation: It is a common and widespread species with no conservation concerns.

It colonizes moist meadows and woodlands by forming dense mats that outcompete other low growing plants.

Value to wildlife: larval host plant for butterflies
Pollinators: beetles
Uses: ground cover, pasture grass, erosion control

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 6/9
Light: 4/9
Temperature: 5/9
Moisture: 8/9
Nutrients: 6/9

Taxonomy resolved against GBIF.

Questions people ask

Is Poa trivialis a good lawn grass?: It is excellent for damp, shady areas but can be invasive in moist or heavily watered lawns, and it thins out in sunny, dry spots.
How do I control it?: Improve drainage and reduce shade if you want to discourage its growth.

Where the name comes from

The genus name Poa is Greek for fodder, while the species name trivialis means common or found everywhere.

Good to know

It thrives in damp, shady spots where other grasses struggle.
It spreads aggressively through above ground runners called stolons.
It is highly tolerant of wet, heavy soils.

Keep your roughstalk bluegrass growing

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This guide was generated with AI on October 19, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.