How much sun does Long Mannagrass need?

Long Mannagrass grows best in part sun conditions.

When does Long Mannagrass bloom?

Long Mannagrass blooms in June, July, and August.

Where is Long Mannagrass native?

Long Mannagrass (Glyceria melicaria) is native to AL, CT, GA, KY and 15 more states, per vouchered herbarium specimen records and regional native plant society lists.

Is Long Mannagrass toxic to livestock?

The USDA PLANTS Database does not flag Long Mannagrass as toxic to livestock.

Is Long Mannagrass HOA-friendly?

Long Mannagrass takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Long Mannagrass

Name: Pollinator Patch
Author: Pollinator Patch

Glyceria melicaria

Last reviewed: August 2026

Toxicity unknown

Long Mannagrass (Glyceria melicaria) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

The USDA PLANTS Database (opens in new tab) does not flag Long Mannagrass as toxic to livestock.

Light

part sun

Water

medium

Size

12"–36" H × 6"–24" W

Bloom

Jun, Jul, Aug

Native to

AL, CT, GA, KY and 15 more states

Before you buy

Your city may pay you to plant this

Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 452 programs across 44 states, each with a link to the provider and the date we last checked it.

Find rebates in your area

Browse plants for this ecoregion

Piedmont Northeastern Highlands Northeastern Coastal Zone Northern Allegheny Plateau Erie Drift Plain Northern Forests Northern Piedmont Southeastern Plains Blue Ridge Ridge and Valley Central Appalachians Western Allegheny Plateau Acadian Plains and Hills Eastern Great Lakes Lowlands Atlantic Coastal Pine Barrens

Glyceria melicaria is a native perennial grass that forms clumps 1-3 feet tall with a moderate spread. It produces delicate flower heads during summer months and thrives in partial sun with average moisture. This cool-season grass provides a naturalistic texture to garden beds.

In an HOA neighborhood

Long Mannagrass takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.

Works well in: backyard only.

Requires consistently wet conditions that may create soggy appearance
Can look unkempt compared to traditional turf grass
May spread beyond intended planting area

Wildlife value

This native grass produces seeds that feed songbirds and small mammals. The foliage provides nesting material and shelter for various wildlife species.

Common questions

How much sun does Long Mannagrass need?: Long Mannagrass grows best in part sun conditions.
When does Long Mannagrass bloom?: Long Mannagrass blooms in June, July, and August.
Where is Long Mannagrass native?: Long Mannagrass (Glyceria melicaria) is native to AL, CT, GA, KY and 15 more states, per vouchered herbarium specimen records and regional native plant society lists.
Is Long Mannagrass toxic to livestock?: The USDA PLANTS Database does not flag Long Mannagrass as toxic to livestock.
Is Long Mannagrass HOA-friendly?: Long Mannagrass takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.

See all plant problem guides

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