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Pictured: Glyceria grandis — the species. This variety isn’t separately illustrated.
Poaceae family

American Mannagrass (var. grandis) Glyceria grandis var. grandis variety

Native

American Mannagrass (var. grandis) is a perennial grass native to Alaska, Canada, and the lower 48 states.

More about this plant

Glyceria grandis is a species of grass known by the common name American mannagrass. It is native to Canada and the United States, where it is widespread in distribution. It is most commonly found in wet areas such as riverbanks and ponds. Wikipedia →

Growing & care

USDA PLANTS · TRY
Conditions
Sources · Conditions
Cold hardiness (derived) — Hardiness
Hardiness
≥ zone 4 derived from its U.S. range
Size & form
Sources · Size & form
USDA PLANTS — Lifespan
Lifespan
Perennial
In the garden
Herb layer — Sits in the herb of a layered food forest or polyculture.Open guide →
derived roles
Species characteristics from USDA PLANTS (public domain) + TRY (CC BY) — general guidance, not a guarantee for your exact site. Deer "browsing" is documented palatability, not a deer-proof claim.

Wildlife & pollinators

How pollinator value is scored →
❧ Caterpillar hosts ~9 caterpillar species

Glyceria supports ~9 caterpillar species.

Native butterfly & moth caterpillars are the base of the terrestrial food web — most songbirds rear their young almost entirely on them. As a host for native Lepidoptera this is a modest genus.

Recorded feeding on Glyceria in North America, including:

Aletia oxygala · owlet moth Apamea devastator · Glassy Cutworm Apamea dubitans · Doubtful Apamea Apamea impulsa · owlet moth Elachista irrorata · grass-miner moth Hydraecia medialis · owlet moth
+ 7 more species →
Leucania commoides · owlet moth Leucania lapidaria · owlet moth Plusia contexta · Connected Looper Plusia putnami · Lempkes Gold Spot Pseudaletia unipuncta · White-Speck Pseudohermonassa bicarnea · Pink-Spotted Dart Moth Pseudohermonassa tenuicula · Morrison's Sooty Dart
Keystone count (genus-level) from Warren II 2026 (CC0) · Tallamy host-use records. Named species (a documented Nearctic sample, not exhaustive) from NHM HOSTS (CC0).
Species thumbnails re-hosted from iNaturalist — Creative Commons, credited per image (hover for credit). Click any species to see it on iNaturalist. Not exhaustive; many taxa have no openly-licensed photo yet.
Sources for this entry (13) Open & cited
[01] Scientific name & family — USDA PLANTS (DwCA, Zenodo 17903503)
[02] Growth habit & duration — USDA PLANTS (DwCA, Zenodo 17903503)
[03] Native status & distribution — USDA PLANTS (DwCA, Zenodo 17903503)
[04] Common name — USDA PLANTS (via GBIF)
[05] Invasive / introduced status — USDA PLANTS (DwCA, Zenodo 17903503) — native status
[06] Description — Wikipedia (CC BY-SA)
[07] Ecological value — Warren II 2026 (CC0) · Tallamy host-use counts
[08] Conservation rank — NatureServe Explorer (CC BY)
[09] Cold hardiness (derived) — Derived from U.S. range × USDA PHZM zones
[11] Caterpillar host count — Warren II 2026 (Dryad, CC0) · Tallamy host-use counts
[12] Caterpillar species — NHM HOSTS (CC0)
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