grassN. America Native

Blue Joint Grass

Calamagrostis canadensis

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Grass

Height

48 inches

Width

30 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7

Water

Medium to Wet

Humidity

Adaptable

Lifespan

Long-lived perennial

Native To

North America

Toxicity

Non-toxic

The Story

Plant Bio

Calamagrostis canadensis is a cool-season, rhizomatous perennial grass native to wetlands and moist areas across North America. It forms dense colonies with upright stems and airy, purplish-green flower panicles. This species is particularly valuable for its ability to thrive in wet to moist soils, making it an excellent choice for rain gardens, pond edges, and erosion control in damp areas. It spreads by rhizomes to form substantial colonies.

Bloom Period:

EarlyLate

Uses & Benefits:

Blue Joint Grass offers a soft, naturalistic texture with its fine leaves and delicate, airy seed heads that transition from purplish-green to tan. It provides movement and sound in the garden as breezes pass through it.

Its dense, rhizomatous root system is highly effective for soil stabilization and erosion control along stream banks, pond edges, and in bioswales. It is a key component in wetland restoration projects.

As a native grass, it provides food and shelter for a wide range of wildlife. Birds eat the seeds, and various insects, including some skipper butterflies, use it as a larval host plant. It also provides cover for waterfowl.

Marketplace

Where to Buy

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Planting

How to Grow

Select a site with full sun to light shade and consistently moist soil.
Prepare the planting area by removing weeds.
Dig a hole slightly larger than the plant's container.
Place the plant in the hole so the crown is at soil level.
Backfill with soil and water in well.
Keep the soil moist, especially during the first growing season.

Pro Tip

Be mindful of its spreading habit; use it in naturalized areas or install a root barrier if spread is a concern.

Keep It Thriving

Care Guide

Do

Provide consistent moisture; this is not a drought-tolerant grass.
Allow it to self-sow and spread in naturalized areas.
Cut back old foliage in late winter to make way for new growth.
Use it in rain gardens to help manage stormwater runoff.

Don't

Do not plant in dry, sandy, or upland garden sites.
Avoid planting in small, formal beds unless you can contain its spread.
Do not fertilize; it thrives in average to lean soils.
Don't remove the seed heads in fall; they provide winter interest and food for birds.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Plant
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Naturalistic wetland plantingRain garden backboneErosion control on moist slopes

Companion Plants

Eupatorium maculatum Iris versicolor Juncus effusus Lobelia cardinalis Asclepias incarnata

Multiply

Propagation Methods

Good to Know

Common Questions

Blue Joint Grass questions

What zones can Blue Joint Grass grow in?

Blue Joint Grass is hardy in USDA Zones 4–7. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Blue Joint Grass deer resistant?

Yes — Blue Joint Grass is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Blue Joint Grass bloom?

Blue Joint Grass typically blooms in early summer through mid-summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Blue Joint Grass need full sun?

Blue Joint Grass does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.