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Poaceae family

Largeflower Speargrass Poa eminens

Native

Largeflower Speargrass is a perennial grass native to Alaska and Canada. It grows to 2 ft in part shade – shade.

Growing & care

USDA PLANTS · TRY
Conditions
Sources · Conditions
USDA PLANTS — Sun
USDA — SoilPH — Soil pH
USDA PLANTS (DwCA, Zenodo 17903503) — Fertility Requirement / Soil Adaptation — Fertility need
USDA — Temp-Min °F — Hardiness
Sun
Part shade – shade
Soil pH
5–7.5
Fertility need
Medium
Hardiness
USDA zone 2+
Size & form
Sources · Size & form
USDA PLANTS (DwCA, Zenodo 17903503) — Height, Mature — Height
USDA PLANTS (DwCA, Zenodo 17903503) — Planting Density (per acre) — Spacing
USDA PLANTS (DwCA, Zenodo 17903503) — Growth Rate / Spread / Growth Form / Lifespan / Active Growth Period / Seed Period — Spread · Growth rate · Growth form · Active growth
USDA PLANTS — Lifespan
TRY Plant Trait Database (CC BY 4.0) · USDA PLANTS — Foliage
Height
2 ft
Spacing
1.5–3 ft apart from USDA planting density
Spread
Moderate
Growth rate
Moderate
Growth form
Rhizomatous
Lifespan
Perennial · short-lived
Foliage
Broadleaf · fine texture
Active growth
Summer
In the garden
Sources · In the garden
USDA PLANTS (DwCA, Zenodo 17903503) — Propagation Method / Commercial Availability — Propagate by · In the trade
USDA PLANTS (DwCA, Zenodo 17903503) — Germination (cold stratification) — Seed starting
USDA PLANTS (DwCA, Zenodo 17903503) — Foliage Texture / Browse Palatability / Resprout — Resprouts if cut
Propagate by
Seed, Sod
Seed starting
No stratification needed
In the trade
Routinely available
Resprouts if cut
No
Herb layer — Sits in the herb of a layered food forest or polyculture.Open guide →
derived roles
When to sow · for your area

Sow timing keys off your local last- and first-frost dates.

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 ~42 caterpillar species

Poa supports ~42 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 strong genus.

Recorded feeding on Poa in North America, including:

Actebia fennica · owlet moth Amblyscirtes hegon · Pepper And Salt Skipper Amblyscirtes vialis · Common Roadside-Skipper Ancyloxypha numitor · Least Skipper Anicla infecta · Green Cutworm Moth Antaeotricha stenoma · concealer moth
+ 8 more species →
Apamea devastator · Glassy Cutworm Apamea obscuroides · owlet moth Arugisa latiorella · Watson's Arugisa Asymmetrura graminivorella Atalopedes campestris · Sachem Automeris patagoniensis · giant silk moth Cercyonis meadii · Mead's Wood Nymph Cercyonis oetus · Small Wood Nymph
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.
How we know this (1) Methods & honest limits
Photosynthesis Direct fact

A recorded categorical fact: each species is tagged C3 (standard), C4 (heat/water-efficient) or CAM (succulent, night-time CO₂ uptake) — or a facultative combination. We only show a trait card for the noteworthy C4/CAM cases; C3 is the unremarkable majority, kept in the data but not surfaced as a card.

Kattge, J. et al. TRY plant trait database — Categorical Traits Dataset (2012).
Derived values are computed from open data by a published method — labelled, cited, and never shown as a direct observation. Full methodology →
Sources for this entry (26) 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)
[17] Invasive / introduced status — USDA PLANTS (DwCA, Zenodo 17903503) — native status
[18] Wetland indicator — USACE National Wetland Plant List (2022)
[20] Ecological value — Warren II 2026 (CC0) · Tallamy host-use counts
[21] Conservation rank — NatureServe Explorer (CC BY)
[23] Functional traits — TRY Plant Trait Database (CC BY 4.0)
[24] Photosynthetic pathway — TRY Plant Trait Database (CC BY 4.0)
[25] Caterpillar host count — Warren II 2026 (Dryad, CC0) · Tallamy host-use counts
[26] Caterpillar species — NHM HOSTS (CC0)
Spot an error or have a better photo? Every field links to its source, and the whole dataset is open.
Cite this page Open data, please attribute

PlantKey’s data is open under CC BY-SA 4.0 — free to reuse and adapt, with attribution and the same licence. Photos keep their own per-image licence + credit (see Sources above).

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