Species Brief
Ventenata dubia, ventenata
Written
July, 2026
Contributors
Ilana L. Abrahamson - 1st Compiler, Leila Duchac - 1st Editor
Abrahamson, Ilana L., compiler. 2026. Species Brief: Ventenata dubia, ventenata. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Missoula Fire Sciences Laboratory (Producer). Available: https://research.fs.usda.gov/feis/species-briefs/vendub
DOI
10.2737/feis-species-brief-vendub
Scientific Name
Ventenata dubia
Common Names
ventenata
ventenatagrass
wiregrass
softbearded oat grass
North African wiregrass
North African grass
North-Africa grass
North Africa grass
FEIS Lifeform Type
Graminoid
Kingdom
Plantae
Class
Liliopsida (Monocot)
Order
Cyperales
Family
Poaceae
Genus
Ventenata
Nativity
Nonnative
Invasiveness
Invasive
This Species Brief is a concise summary of the biological, ecological, and fire‑related characteristics of an individual species derived from a Fire Effects Information System (FEIS) Species Review. Table 1 is derived from a standardized template and highlights these characteristics.
| Attribute | Characteristic | Justification | Source |
|---|---|---|---|
| Biological characteristics | |||
| Life form | Graminoid | Ventenata is an annual grass, typically 15 to 46 cm tall. | FEIS: Botanical Description [1] |
| Typical lifespan | 0-1 year | Ventenata is a winter annual. | FEIS: Seasonal Development [1] |
| Life cycle | Annual | Ventenata is a winter annual that typically germinates and grows in fall, becomes dormant in the winter, and resumes growth in the spring. It flowers and produces seeds in spring or summer and dies in summer. | FEIS: Seasonal Development [1] |
| Drought tolerance | Moderate* | Ventenata grows best on relatively moist sites and prefers seasonally wet ground, but it also spreads onto drier sites such as dry southern and western aspects. It often occurs on dry, open, and often-disturbed areas. One study found that ventenata seed density increased in the soil seed bank after 3 years of experimentally induced drought. | FEIS: Plant Growth; Site Characteristics; Seed Banking [1] |
| Rooting depth | Shallow | Roots are shallow, from 2.5 to 5 cm deep. | FEIS: Botanical Description [1] |
| Bark thickness at maturity | N/A | This attribute applies to trees. | N/A |
| Sheds low branches | N/A | This attribute applies to trees. | N/A |
| Reproduction and Regeneration | |||
| Adventitious buds | Tiller* | Ventenata may produce tillers, which may resprout if cut before the soil dries. | FEIS: Vegetative Reproduction and Regeneration [1] |
| Time to reproductive maturity | 0-1 year | As a winter annual, ventenata typically germinates in fall and flowers and produces seeds in the following spring or summer. | FEIS: Seasonal Development [1] |
| Soil seed bank longevity | 0-1 year; Short-term persistent (1-5 years)* | Most seeds germinate the first year after dispersal. However, ventenata also has a short-term persistent soil seed bank with <1% of seeds viable for up to 3 years. | FEIS: Seed Banking [1] |
| Serotinous cones | N/A | This attribute applies to conifers. Ventenata produces seeds with awns. | FEIS: Seed Dispersal [1] |
| Seed dispersal mechanism | Gravity; Animal | Seeds drop near the parent plant when ripe. They are also dispersed by animals and humans, with the bent, twisted awns catching onto fur, feathers, clothing, and machinery. | FEIS: Seed Dispersal [1] |
| Seed dispersal distance | Short (mostly under parent plant); Medium; Long (>1 km)* | Seeds drop near the parent plant when ripe. Animals may disperse seeds farther, but no distances are given. | FEIS: Seed Dispersal [1] |
| Optimal conditions for seedling establishment | Bare soil; Litter and/or duff; Sun* | While ventenata establishes on bare soil, and its abundance is often higher on bare soil, its emergence and survival may be higher on sites with ventenata litter than on sites with bare soil. Ventenata grows on open to partially closed sites, but does not appear to be invasive under closed canopies. The source does not indicate whether seedlings require sun to establish. | FEIS: Seedling Establishment and Mortality; Successional Status [1] |
| Successional Status | |||
| Shade tolerance | Moderately shade tolerant | Ventenata grows on open to partially closed sites, but it does not appear to be invasive under closed canopies. In savannas and woodlands in Oregon, ventenata occurs in open to lightly shaded areas, especially after tree cutting. | FEIS: Successional Status [1] |
| Successional status | Early | Ventenata is a nonnative annual that often establishes on bare soil. Disturbances that reduce vegetation and expose bare soil appear to favor its establishment in some areas. However, it also occurs on undisturbed sites including scablands, Palouse Prairie, and unburned western juniper-ponderosa pine woodlands, and dry ponderosa pine-Rocky Mountain Douglas-fir forests. | FEIS: Successional Status [1] |
| Fire | |||
| Primary fire response(s) or adaptation(s) | Recruit | After fire, ventenata establishes from seed, either from the soil seed bank or from animal-dispersed off-site seed. Fire-created openings may favor its germination and seedling establishment, especially in forests. | FEIS: Fire Adaptations [1] |
| Germination is fire stimulated | Rarely/No | Germination typically occurs after the first fall rains at moderate to high fall temperatures. Fire probably kills some ventenata seeds, especially if seedheads have not yet shattered. | FEIS: Germination; Immediate Fire Effects [1] |
| Flowering/fruiting is fire stimulated | Rarely/No | Ventenata flowers and sets seed after spring growth. The source does not describe fire-stimulated flowering. | FEIS: Seasonal Development [1] |
| Season when it is most sensitive to fire | Fall* | In Palouse prairie, one researcher recommended fall burning to reduce ventenata litter (timed when ventenata is growing and native species are dormant) followed by herbicide to kill ventenata and increase native species cover. However, this recommendation was based on <1 year of posttreatment data, and burning should not be frequent or severe and should only occur in areas where native species are fire-adapted. Another study found fall or spring burning with fall herbicide application yielded the greatest decrease in ventenata cover. Fall burning alone also reduced ventenata cover where ventenata had high pretreatment cover. Information regarding sensitivity to fire by season was not available for other plant communities. | FEIS: Fire as a Control Agent [1] |
| Plant flammability | High | Ventenata is dry and remains highly flammable throughout the fire season, and it tends to dry out earlier than associated perennial grasses. | FEIS: Fuel and Fire Characteristics [1] |
| Early colonizer/recolonizer of burned or disturbed sites | Frequently | Few studies were available on ventenata’s response to fire, but it can establish after fire in both low- and high-severity burned patches, and fire-created openings may favor its germination and seedling establishment, especially in forests. Fire's effects on abundance are less clear; most studies showed ventenata abundance was unaffected by fire, while other studies found that abundance increased or decreased. | FEIS: Plant Response to Fire; Fire Adaptations; Summary [1] |
| Effect of fire exclusion on population | Varies throughout habitat or range | In the Pacific Northwest, ventenata is most common in Palouse prairie, canyon grasslands, sagebrush steppes, sagebrush scablands, juniper and ponderosa pine woodlands, and dry mixed-conifer forests. These communities have varied fire regimes, consequently ventenata may respond differently to fire exclusion among communities. For example, excluding fire from forests could reduce ventenata populations due to closing canopies, while fire occurrence does not appear to affect its abundance in Palouse prairie. | FEIS: Plant Communities; Plant Response to Fire [1] |
| Is this species typically managed with prescribed fire? | Rarely/No | Prescribed fire alone is not recommended to control ventenata, although limited evidence suggests short-term population reductions may be possible when prescribed fire is combined with other control methods. Only one study found a reduction in ventenata cover and biomass after fire (<1 year after a fall prescribed fire), whereas most studies found that ventenata abundance was either unaffected or increased after fire. | FEIS: Fire as a Control Agent [1] |
| Predominant historical fire frequencies of ecosystem where it most commonly occurs | Frequent; Mid-frequency; Infrequent* | Ventenata occurs in ecosystems that historically had varied fire regimes. Dry mixed-conifer forests and ponderosa pine woodlands experienced mean historical fire intervals ranging from about 10 to 49 years. Fire intervals in western juniper woodlands in the Columbia Basin likely ranged from decades to centuries. Modeled historical mean fire intervals range from 21 to 35 years for Palouse prairie in the Columbia Basin and average 250 years for Columbia Plateau scabland shrubland. Estimates in sagebrush communities vary widely, from decades to centuries to millennia. | FEIS: Fire Regimes [1] |
| Predominant historical fire severity where it most commonly occurs | Low; Mixed; Replacement | Dry mixed-conifer forests and ponderosa pine woodlands had mostly low- to moderate-severity surface fires, western juniper woodlands included replacement, mixed, and low-severity surface fires, and sagebrush community fires were mostly patchy but high-severity. | FEIS: Fire Regimes [1] |
| Predominant historical fire regime group where it most commonly occurs | 1; 5 | Historical fire regimes vary across Ventenata's distribution. The dry forests, woodlands, and prairie where ventenata is most invasive had frequent, low- to moderate-severity surface fires (group 1), while the sagebrush steppe and scabland it also commonly occupies had long-interval, replacement-severity fire (group 5). | FEIS: Fire Regimes [1] |
| Alters historical fuel characteristics of ecosystems where it occurs | Yes, invasive species | Ventenata invasion increases fine fuel load and continuity by establishing in interspaces between shrubs and perennial bunchgrasses, increasing the potential for fire spread in areas that historically had discontinuous fuels. | FEIS: Fuel and Fire Characteristics [1] |
1. Innes, Robin J. 2022. Ventenata dubia, ventenata. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Missoula Fire Sciences Laboratory (Producer). Available: https://research.fs.usda.gov/feis/species-reviews/vendub
Last updated August 24, 2026