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Iridaceae family

Stool Iris Iris aphylla

Stool Iris is an introduced perennial herb, found in the lower 48 states. It grows to 0.7 ft.

More about this plant

Iris aphylla is a species in the genus Iris, it is also in the subgenus Iris, and in the section Iris. It is a rhizomatous perennial, from Asia to Europe. It is found in Azerbaijan, Russian Federation, Czech Republic, Germany, Hungary, Poland, Belarus, Ukraine, Bulgaria, Albania, Former Yugoslavia, Italy, Romania and France. It has dark green or bright green, sword-shaped, long grass-like leaves, that die/fade away in the winter. It also has a slender stem, with several branches and green and purplish spathes. It has 3–5 large flowers, in shades of bright purple, purple, violet, dark blue, blue-violet and dark violet, which bloom between spring and early summer. Occasionally, they re-bloom in the autumn, before the seed capsule is formed. It is cultivated as an ornamental plant in temperate regions. There is one known subspecies Iris aphylla subsp. hungarica Hegi. Wikipedia →

Growing & care

USDA PLANTS · TRY
Conditions
Sources · Conditions
Cold hardiness (derived) — Hardiness
Hardiness
≥ zone 8 derived from its U.S. range
Size & form
Sources · Size & form
TRY Plant Trait Database (CC BY 4.0) — Height · Foliage
USDA PLANTS — Lifespan
Height
0.7 ft
Lifespan
Perennial
Foliage
Broadleaf
In the garden
Ground-cover layer — Sits in the ground-cover of a layered food forest or polyculture.Open guide →
Living mulch / groundcover — Low, ground-hugging grower — can carpet bare soil as a living mulch, shading out weeds and holding moisture.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 ~16 caterpillar species

Iris supports ~16 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 moderate genus.

Recorded feeding on Iris in North America, including:

Amphipoea keiferi · owlet moth Celaena reniformis · owlet moth Ctenucha virginica · Virginia Ctenucha Endothenia hebesana · Verbena Bud Moth Endothenia rubipunctana · leafroller moth Hydraecia micacea · Rosy Rustic
+ 8 more species →
Lophocampa ingens · tiger moth Lymantria dispar · Gypsy Moth Macronoctua onusta · Iris Borer Moodna ostrinella · Darker Moodna Moth Orgyia leucostigma · White-Marked Tussock Moth Papaipema cataphracta · Burdock Borer Papaipema nebris · Stalk Borer Sparganothis pilleriana · leafroller moth
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).
✦ Bees 4 bee visitors
Visitor records (observations, not exhaustive) from Noori et al. 2026 (CC BY 4.0) · GloBI →
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 (17) 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 — US-RIIS v2.0 (USGS)
[07] Description — Wikipedia (CC BY-SA)
[08] Ecological value — Warren II 2026 (CC0) · Tallamy host-use counts
[11] Photosynthetic pathway — TRY Plant Trait Database (CC BY 4.0)
[12] Cold hardiness (derived) — Derived from U.S. range × USDA PHZM zones
[14] Flower-visitor value (derived) — Noori et al. 2026 (CC BY 4.0) · GloBI
[15] Caterpillar host count — Warren II 2026 (Dryad, CC0) · Tallamy host-use counts
[16] Caterpillar species — NHM HOSTS (CC0)
[17] 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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