© Connor Gordon · CC BY-NC
iNaturalist — CC, credited & licensed per image
Juncaceae family
Tweedy's Rush Juncus tweedyi
Native
Tweedy's Rush is a perennial grass native to the lower 48 states. It blooms Jul – Aug.
More about this plant
Juncus tweedyi, the narrow-panicled rush, is a species of flowering plant in the family Juncaceae. It is native to southern Canada, and the northern USA, extending down the mountain ranges. A perennial reaching 24 in (60 cm), it is typically found in wet areas, such as the edges of beaver ponds. Wikipedia →
Growing & care
USDA PLANTS · TRY Conditions
Sources · Conditions
Cold hardiness (derived) — Hardiness
- Hardiness
- ≥ zone 6 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 The garden year bloom → fruit → fall colour
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F
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Bloom
Bloom (the flower's colour)
Bloom · Jul – Aug — 14 obs · Herbarium specimens — Park et al. 2023 (CC BY 4.0)
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 ~6 caterpillar species
Juncus supports ~6 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 Juncus in North America, including:
+ 8 more species → ↑ show fewer
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.
Related plants
More Juncus → Native
Annual Rush
Juncus abortivus
●○○○○ 
Native
Arctic Rush
Juncus arcticus
●○○○○ 
Native
Basket Rush
Juncus textilis
●○○○○ 
Native
Bayonet Rush
Juncus militaris
●○○○○ 
Native
Bighead Rush
Juncus megacephalus
●○○○○ 
Native
Bog Rush
Juncus biflorus
●○○○○ Same genus / family, ranked by ecological value — from the PlantKey catalog
Sources for this entry (15) 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] Photos — iNaturalist — CC, credited per image
[07] Description — Wikipedia (CC BY-SA)
[08] Ecological value — Warren II 2026 (CC0) · Tallamy host-use counts
[09] Bloom period — Herbarium specimens — Park et al. 2023 (CC BY 4.0)
[10] Conservation rank — NatureServe Explorer (CC BY)
[11] Cold hardiness (derived) — Derived from U.S. range × USDA PHZM zones
[12] Chromosomes — ChromoDB — IAPT/IOPB chromosome data series (Zenodo, CC BY 4.0)
[13] Caterpillar host count — Warren II 2026 (Dryad, CC0) · Tallamy host-use counts
[14] Caterpillar species — NHM HOSTS (CC0)
[15] County range — GBIF Open Data — open-licensed occurrences (CC0/CC-BY) → county
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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