Does it need full sun?

Yes, it performs best in full sun but tolerates light shade.

How often should I mow it?

Keep it at a height of 5 to 8 centimeters for the healthiest turf.

Plant guide

Kentucky bluegrass.

Poa pratensis

Pronounced POH-uh pruh-TEN-sis

Also known as English Meadow Grass, Kentucky Bluegrass, Meadow Grass, Smooth Meadow Grass, Smooth Meadow Grass, Kenturky Blue Grass, Smooth Meadow-Grass, Smooth Stalked Meadow Grass

Smooth Meadow-grass — Photo by Douglas Goldman (CC BY-SA) via iNaturalist

Kentucky bluegrass is a popular cool season perennial grass known for its lush, deep green color. It spreads through underground stems called rhizomes to create a dense, carpet like lawn. This grass is a favorite for home landscapes because it recovers well from foot traffic.

At a glance

Care level: Moderate
Plant type: Perennial grass
Light: Full sun to partial shade
Indoor light: Direct sun
Water: Every 2 to 4 days
Mature size: 2 to 3 feet tall
Growth rate: Medium
Hardiness: USDA 3 to 7
Bloom time: Late spring to early summer

Care

Keep the soil consistently moist but not waterlogged to encourage healthy root development. Watch for thinning patches or browning during hot, dry spells which indicate the grass needs more hydration. Regular mowing at a higher setting helps keep the soil cool and prevents weed growth.

Watering: Water deeply and infrequently to encourage deep roots rather than shallow, frequent sprinkles.
Feeding: Apply a balanced fertilizer during the active growing seasons in spring and fall.
Pruning: Mow regularly during the growing season, keeping the blades sharp for a clean cut.
Repotting: This is a lawn grass and is not suitable for container cultivation.
Soil: Well drained, fertile loam
Soil pH: 6.0 to 7.0
Temperature: -30 to 35°C
Humidity: 40 to 70%

Safety

People: It is generally non-toxic to humans.
Children: It is safe for children to play on, though ingestion of large amounts of raw grass is not recommended.
Contact allergens: The leaf blades can cause minor mechanical skin irritation if handled roughly.
Airborne allergens: The pollen is a common seasonal allergen for many people during the spring.
Edibility: This grass is not intended for human consumption.

How to identify it

V shaped leaf blade tip
Boat shaped leaf tips
Deep green color
Spreads via underground rhizomes

Height: 0.3 to 0.9m
Spread: 0.1 to 0.3m
Leaves: green, blue-green, perennial
Flowers: green, purple, 0.2 to 0.5cm

Problems to watch for

Powdery mildew · A white fungal growth appears on leaves during periods of high humidity.
Dollar spot · Small, bleached circular patches form on the turf.

By symptom

Plant problems by symptom

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Growing it

Propagation: seed, rhizome division
When to plant: spring, early autumn

Mixing grass species creates a more resilient lawn that handles stress better than a monoculture.

Grows well with

Perennial ryegrass · It establishes quickly to provide cover while the bluegrass fills in.
White clover · It fixes nitrogen in the soil to help the grass grow.

Similar species

Rough bluegrass · It is a close relative that prefers much wetter, shadier conditions.

Science

Family: Poaceae
Genus: Poa
Order: Poales
Class: Liliopsida
Native range: Europe, Asia, and northern Africa.
Conservation: It is a widely naturalized species and is not of conservation concern.

It forms dense sod that helps stabilize soil and outcompetes many weeds.

Value to wildlife: larval host plant, nesting material
Pollinators: bees, butterflies
Uses: lawn grass, pasture forage, erosion control

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 7/9
Temperature: 4/9
Moisture: 5/9
Nutrients: 6/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need full sun?: Yes, it performs best in full sun but tolerates light shade.
How often should I mow it?: Keep it at a height of 5 to 8 centimeters for the healthiest turf.

Where the name comes from

Poa is the Greek word for grass, while pratensis means growing in meadows.

Good to know

It spreads through underground stems called rhizomes.
It is actually native to Europe and parts of Asia.
The name Kentucky bluegrass comes from the bluish color of its seed heads.

Keep your kentucky bluegrass growing

This page is a general guide. Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked.

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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.