Does it need a lot of water?

It prefers consistent moisture but can handle short dry spells once established.

Can I grow it in shade?

It prefers full sun but will tolerate light, dappled shade.

Plant guide

Common bent.

Agrostis capillaris

Pronounced a-GROS-tis ka-pil-LA-ris

Also known as Bent Grass, Browntop, Browntop Bent, Colonial Bent, Colonial Bent Grass, Colonial Bentgrass, Common Bent, Common Bent Grass

Common bent is a cool season grass that spreads through underground stems. It forms a dense turf that is quite popular for lawns and golf courses. You will find it thrives in temperate climates where it can spread across open fields.

At a glance

Care level: Easy
Plant type: Perennial grass
Light: Full sun to partial shade
Indoor light: Direct sun
Water: Every 2 to 5 days
Mature size: 20 to 60 cm
Growth rate: Fast
Hardiness: USDA 4 to 9
Bloom time: Early to mid summer

Care

Keep the soil consistently moist to maintain a lush appearance. Watch for thinning patches which might suggest the soil is too dry or nutrient deficient. Regular mowing helps keep the grass dense and prevents it from becoming too leggy.

Watering: Water deeply whenever the top inch of soil feels dry to the touch.
Feeding: Apply a balanced fertilizer during the active growing season to support thick growth.
Pruning: Mow regularly to maintain your desired height and encourage lateral spread.
Repotting: If growing in containers, divide the root mass every couple of years to prevent overcrowding.
Soil: Well drained loam or clay
Soil pH: 5.5 to 7.0
Temperature: -20 to 30°C
Humidity: 40 to 70%
Drought tolerance: Moderate
Lifespan: Perennial, typically 3 to 5 years in managed turf.
Deer and rabbits: Moderate

Signs it needs repotting

Roots circling the bottom of the tray.
Growth slowing significantly.

Safety

People: It is not considered toxic to humans.
Children: There are no specific safety concerns for children, though the blades can be sharp.
Contact allergens: The fine, sharp leaf blades can cause minor skin irritation if handled roughly.
Airborne allergens: The pollen is a common seasonal allergen for many people during the summer months.
Edibility: This grass is not intended for human consumption.

How to identify it

Fine textured green blades
Forms dense creeping mats
Delicate open panicle flowers
Ligule is short and blunt

Height: 0.2 to 0.7m
Spread: 0.1 to 0.3m
Leaves: green, deciduous
Flowers: green, purple, 0.1 to 0.3cm

Problems to watch for

Dollar spot · Small, sunken patches of bleached grass appear during humid weather.
Red thread · Pinkish fungal threads develop on the leaf tips during cool, damp periods.

By symptom

Plant problems by symptom

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Growing it

Propagation: division, seed
When to plant: spring, autumn
Overwintering: It goes dormant in cold weather and requires no special winter protection.
In containers: It is not typically grown in containers as it requires a large area to spread.

Division

1. Dig up a clump in early spring.
2. Pull the clump apart into smaller pieces.
3. Replant the divisions immediately.

Seed

1. Prepare a fine, weed free seedbed.
2. Scatter seeds evenly in early autumn.
3. Lightly rake and keep moist until germination.

Pair with other low nutrient grasses to create a stable, low maintenance lawn.

Grows well with

Red Fescue · They share similar soil requirements and form a dense, durable turf.
Sweet Vernal Grass · It adds structural diversity to meadow plantings.

Similar species

Creeping Bentgrass · It spreads much faster via surface runners compared to the slower colonial bent.

Science

Family: Poaceae
Genus: Agrostis
Order: Poales
Class: Liliopsida
Native range: Europe and temperate Asia.
Conservation: It is a widespread and common species with no special conservation status.

It thrives in nutrient poor, acidic soils where it outcompetes many other grasses.

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

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 3/9
Light: 7/9
Temperature: 5/9
Moisture: 5/9
Nutrients: 3/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need a lot of water?: It prefers consistent moisture but can handle short dry spells once established.
Can I grow it in shade?: It prefers full sun but will tolerate light, dappled shade.

Where the name comes from

The name Agrostis comes from the Greek word for a type of forage grass, while capillaris refers to the hair like appearance of the flower panicles.

Good to know

It is also known as colonial bentgrass.
It spreads slowly through short underground stems called rhizomes.
It tolerates very close mowing, which is why it is used on golf greens.

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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.