This OISC target pest was previously identified as Schizachyrium condensatum.
Hawai‘i-Pacific Weed Risk Assessment Score: 13 (High Risk); Visit https://plantpono.org for more info
Weed Fire Risk Score = 0.81 (This species is likely a high fire risk in Hawai’i); Visit https://pacificfireexchange.org/weed-fire-risk-assessments/ for more information
- Tall grass to 2 m (6 ft) that grows in dense clumps
- Produces large, broom-like tufted seed heads
- Native to tropical and subtropical America, introduction history unknown.
- Unbranched below, freely branching above. Leaves 16 inches long by 0.3 inches wide. Inflorescences at stem terminals, loose, numerous spikes (racemes), light colored.
- Thick growth displaces native plants.
- Grows along roadsides, in disturbed areas and in open sites in shrub land and grassland.
- Each plant produces millions of seeds that are spread by the wind, animals, vehicles and people.
- Dry grass promotes fires and quickly regrows after wildfires.
- Drought tolerant, yet is able to flourish in wetter areas
- Unpalatable to goats and not regarded as an important forage grass.
- Oahu: OISC currently works to control populations in Hālawa Valley along the H-3.
- Maui: None known
- Molokai: None known
- Lanai: None known
- Kahoolawe: None known
- Kauai: None known
- Big Island: Well established in lower pastures of Kahuku unit of Hawaiʻi Volcanoes National Park, Kaʻū District, , where it was first collected in 1961.
- Midway: First established in 1979 near the runway
- Naturalized along roadsides and in open sites in mesic shrubland and grassland, 210-1,310 m, on Kaua’i, O’ahu, and Hawai’i. Primarily occurring in Hawai’i Volcanoes National Park
For more information, see:
- Andropogon glomeratus var. pumilus information fromUSDA NRCS National Plant Data Center
- Schizachyrium condensatum Datasheet from CABI
- Schizachyrium condensatum information from PIER
- Schizachyrium condensatum information from Weeds of Hawaii’s Pastures and Natural Areas
- Invasive Grasses in Hawaiʻi and their impacts