Phalaris tuberosa var. stenoptera (accepted: Phalaris aquatica) · Poaceae · all Phalaris records · also called Hardinggrass · syn. Phalaris tuberosa var. stenoptera · Wikipedia
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Phalaris tuberosa var. stenoptera holds on list recommendation on phalaris tuberosa var stenoptera. On phalaris tuberosa var stenoptera, limited evidence next to phalaris tuberosa stenoptera on Phalaris tuberosa var. stenoptera. The facts stay as separate jobs for phalaris tuberosa var stenoptera — Phalaris tuberosa var. stenoptera. On phalaris tuberosa var stenoptera, on list does not replace limited evidence for phalaris tuberosa stenoptera.
On phalaris tuberosa var stenoptera, Phalaris tuberosa var. stenoptera also carries Low-volume and slow-burning for phalaris tuberosa stenoptera.
Use evidence on phalaris tuberosa var stenoptera for phalaris tuberosa stenoptera. Use related plants on phalaris tuberosa var stenoptera for phalaris tuberosa stenoptera. The sourced rows remain on phalaris tuberosa var stenoptera.
Form
grass
Mature height
~4 ft
Water need
high
Rated in
California
On this lot
1. Fire evidence and conditions
Fire evidence
Fire-resistant — location does not change the cited classification.
Documented in AZ, CA, DC, HI, MS, MT, NC, OR, SC, TX, VA.
Native range
Introduced / established
USDA hardiness
Documented minimum 7b; no upper limit is documented.
3. Legal, ecological, and broader status
Legal-list status
Seed-list status
Reported invasive here
Broader regional context
Federal context
How to read this page
The status above is computed from the cited rows below: independent recommendations can support a fire-resistant result, an avoid row can produce keep-away, and disagreement stays visible as conflict. Placement notes preserve each source’s own scheme rather than translating unlike rules into one scale. This is evidence about a plant, not permission to plant it in every part of the defensible space; Zone 0 remains noncombustible.
Plant hardiness evidence
These values describe the plant source. Your ZIP zone comes from the separate 2023 USDA
Plant Hardiness Zone Map. Whole-zone values stay whole-zone, and a single unresolved value
is not treated as a tolerance range. Different source boundaries stay separate: overlapping
statements are compared independently, while only ranges with no shared zone are called a conflict.
Minimum 7b · no upper limit documented · half zone precision · derived containing band
Exact source measurement: 7°F; mapped only to its containing half-zone.
Source taxon: Phalaris tuberosa var. stenoptera · source identifier match.
Source location: PlantCharacteristics record 24654, Temperature, Minimum (°F).
Where its sources say to plant it
Placement rules below use each source's own distances or named zones, tied to its rating.
They are not interchangeable with the directory's current Zone 0 guidance.
Low-volume and slow-burning vegetation for planting on cl…: Table 2: Grass species recommended for fuelbreak sites in California [nord-green-brushland-clearing-performance] (with its recommendation)
The evidence
Grouped by what each source concluded. Primary evidence rated the plant itself
(a lab, field program, or original curation); corroboration compiled or
republished another source's rating and resolves to its root lineage.
Phalaris tuberosa var. stenoptera (Hardinggrass). FireApproved. https://fireapproved.com/plants/phalaris-tuberosa-var-stenoptera/. Last verified 2026-08-25.