Ventenata

Discuss this plant with the guide — choose this profile as a possible match and prepare your observations for Colorado Plants & Practical Care.

Ventenata dubia

Colorado noxious weed · List A — Eradicate. CO-rules-2025

Uncommon in Colorado. All populations are designated for eradication statewide. This is a management category, separate from danger ratings. Category source · What the lists mean.

Displaces forage and native grassland. Exposure help.

Identification caveat: Added to Colorado List A in the rule effective May 15, 2025. Washington’s different legal class is not applied to Colorado.

Still researching this plant

This is a sourced working profile. Evidence is incomplete for People, Dogs & cats, Other animals. Identification and source-photo limits are explained below. Independent botanical and veterinary review is pending. Uncertainty is not a finding that the plant is safe.

Three views of this plant

Source-identified reference photographs; these are not a complete identification key. A source location outside Colorado does not establish local occurrence.

Ventenata dubia: An open, delicate panicle of pale grass spikelets held against a mountain landscape. — **inflorescence** — An open, delicate panicle of pale grass spikelets held against a mountain landscape.
Matt Lavin · CC BY 4.0
Photo source and identification
Original record · Original image
Source scientific identification plus visual morphology review of the selected photograph. This is a source-identified reference image, not a specimen-based taxonomic determination. Fine grasses require close spikelet and ligule examination. These reference photographs retain the research-grade source identification and should not be used alone as a complete identification key.
iNaturalist large server-resized image; no local crop, colour change, or generative editing. Gallery display preserves the full image; the catalog preview uses a CSS crop.

Ventenata dubia: A dry stand of fine-stemmed grass in an open landscape; broad leaves of other plants occur in the foreground. — **habitat** — A dry stand of fine-stemmed grass in an open landscape; broad leaves of other plants occur in the foreground.
Matt Lavin · CC BY 4.0
Photo source and identification
Original record · Original image
Source scientific identification plus visual morphology review of the selected photograph. This is a source-identified reference image, not a specimen-based taxonomic determination. Fine grasses require close spikelet and ligule examination. These reference photographs retain the research-grade source identification and should not be used alone as a complete identification key.
iNaturalist large server-resized image; no local crop, colour change, or generative editing. Gallery display preserves the full image; the catalog preview uses a CSS crop.

Ventenata dubia: Closer view of narrow pale spikelets and fine branches of the panicle. — **spikelet detail** — Closer view of narrow pale spikelets and fine branches of the panicle.
Matt Lavin · CC BY 4.0
Photo source and identification
Original record · Original image
Source scientific identification plus visual morphology review of the selected photograph. This is a source-identified reference image, not a specimen-based taxonomic determination. Fine grasses require close spikelet and ligule examination. These reference photographs retain the research-grade source identification and should not be used alone as a complete identification key.
iNaturalist large server-resized image; no local crop, colour change, or generative editing. Gallery display preserves the full image; the catalog preview uses a CSS crop.

Recognize

A slender winter annual grass with dark stem nodes and an open, branching seedhead; some awns are bent and twisted. WA-ventenata

Plants & habitat

Invades grasslands and hay systems. Seeds move with equipment and hay, and reduced perennial cover can leave soil vulnerable to erosion. WA-ventenata

People

The reviewed sources do not establish species-specific ingestion effects or a safe exposure amount for people. Missing evidence does not establish safety.

Dogs & cats

The reviewed sources do not establish species-specific ingestion effects or a safe exposure amount for dogs or cats. Missing evidence does not establish safety.

Other animals

Silica-rich mature growth is poor forage and livestock often avoid it. This does not establish chemical-poisoning safety. WA-ventenata

Before taking action

Confirm identification and the requirements of your county weed program. For chemical treatment, follow the current product label, including restrictions around animals and water. S27

This is a statewide eradication priority. Contact your county weed program promptly for identification and an approved management and disposal plan. CO-rules-2025

References

CO-rules-2025 — Colorado Noxious Weed Act rules, 8 CCR 1206-2, Colorado Secretary of State / Department of Agriculture. Accessed 2026-09-07T01:07:48+00:00. Locator: Parts 3.1, 4.1, 5.1; management provisions; effective May 15, 2025.
WA-ventenata — Ventenata, Washington State Noxious Weed Control Board. Accessed 2026-09-07T01:09:01+00:00. Locator: Identification, ecological impacts, management; Washington legal class not applied to Colorado.
S27 — 2103 – Colorado Noxious Weeds, PlantTalk Colorado · CSU Extension. Accessed 2026-09-07T00:23:57+00:00. Locator: List A, B and C management categories.

Content revised 2026-09-07 03:50:00Z · Source checks dated separately in the references.