River Oats
(Chasmanthium latifolium)

Left:  Chasmanthium latifolium  'River Oats' in ASMSA Garden in Fall 2024.

Above:   Reference photo of Chasmanthium latifolium 'River Oats.'

Plant Characteristics

Plant Preference/Growing Conditions: 

Chasmanthium latifolium, commonly known as River Oats, is a perennial grass native to Arkansas and specifically Garland County. This plant thrives in moist, well-drained soils and is often found in riparian zones, making it an excellent choice for gardens that mimic natural habitats.


Growth Habit/Description:

River Oats typically exhibits a clumping growth habit, reaching heights of 3 to 5 feet. Its distinctive seed heads resemble oats, which sway gracefully in the wind, adding visual interest to landscapes.


Bloom Season:

River Oats typically blooms in late summer to early fall, producing attractive seed heads.


Fall and/or Winter Interest?

The plant retains its seed heads into the fall and winter, providing visual interest during these seasons.

Distribution

Habitat: Prefers moist, shaded areas, often found along riverbanks and in woodland settings.

Native to Arkansas? Yes, it is native to Arkansas.

Native to Garland County? Yes, it is also native to Garland County.

Endemic to Arkansas? No, it is not endemic but is widely distributed in the southeastern U.S.

Ecological Value

Host Plant for Caterpillars? 

River Oats (Chasmanthium latifolium) serves as a host plant for various caterpillar species, providing essential food resources during their larval stage, particularly to those of the Skipper butterflies.

Other Known Ecological Value?

Beyond its role as a caterpillar host, River Oats offers habitat for various wildlife, including birds and beneficial insects. Its dense growth helps prevent soil erosion along riverbanks and contributes to the stabilization of ecosystems. Additionally, the plant's seeds provide food for birds, enhancing its ecological significance in the environment.

Other Interesting Facts

Origin of Name:  

The name "River Oats" refers to its habitat and the resemblance of its seed heads to oats.


Related Plant Species:   

Other grasses in the Chasmanthium genus.


Use For Food/Medicine:

Primarily ornamental; not widely used for food or medicine.

References

“Chasmanthium Latifolium (Michx.) Yates.” USDA Plants Database, plants.sc.egov.usda.gov/home/plantProfile?symbol=CHLA5. Accessed 25 Sept. 2024.


Last edited by Lydia Roberston, September 2024.