Chasmanthium latifolium - Uniola latifolia
chas-MAN-thee-um   lat-ih-FOH-lee-um / yoo-nee-OH-luh

Northern Sea Oats - Inland Seaoats  River Oats - Indian Woodoats 
Native Wildflower Seeds and Potted Plants

Easyliving Native Perennial Wildflowers
 for Home Landscaping and Prairie Restoration 

Photo by cj  Habitat Bloom Period Flower Color Height Inches Moisture Plant Spacing Lifespan
Chasmanthium latifolium picture, inland see oats, river oats Shade or Sun July or August Tan to Brown 18 to 36 average to moist 8 to 24 inches Perennial

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Chasmanthium latifolium Seed, Unifola latifolia Seed, Inland Seaoats Seed, Northern Seaoats Seed, and River Oats seed,  

Potted plants are available $5.00 each plus boxing/shipping

 email with your zip code and number of plants for shipping costs on potted plants 

Chasmanthium latifolium seeds
Northern Sea Oats seeds

number of seeds

approximate coverage
in square feet

1 packet -  $ 2.50 + shipping

 150 40 sq ft

1 ounce bulk-  $ 8.00

 6,500 325 sq ft

1 pound bulk-  $110.00

 104,000 5,200 sq ft

Chasmanthium latifolium, Unifola latifolia, Inland Seaoats, Northern Seaoats. .

Chasmanthium = From the Greek chasme (gaping) and anthe (flower)
           latifolium = Wide leaves
              Uniola = Ancient name for Sea Oats

Chasmanthium latifolium or Uniola latifolia has several common names including Northern Sea Oats, Inland Sea Oats, River oats, Creek Oats, inland sea oats, wild oats, Indian Woodoats, Broadleaf uniola, Broadleaf sea-oats, and broadleaf spike grass.  Chasmanthium latifolium is a very attractive ornamental grass that grows best in rich moist soil in shade or sun.  Native Chasmanthium latifolium grass has attractive seed heads often used in both dried and fresh flower arrangements.  

Native Chasmanthium latifolium Northern seaoats occur naturally in bottomland forests, mesic upland forests, valleys, and stream banks from the eastern U.S. west to Nebraska, Texas, and Mexico. Gramineae (Grass Family)

The information below on chasmanthium latifolium complements of USDA, NRCS. 2001. The PLANTS Database, Version 3.1
  ( National Plant Data Center, Baton Rouge, LA 70874-4490 USA.

Alternate Names

Indian woodoats, broadleaf wood-oats, creek oats, Indian sea-oats, inland sea-oats, broadleaf uniola; Uniola latifolia


General: Grass Family (Poaceae).  Chasmanthium latifolium (previously in the Uniola genus and commonly called broadleaf uniola) is a native, rhizomatous perennial often found in small colonies.  The leaves are broad (0.8 to 2.0 cm) and 10-20 cm long.  The leaf shape and size are similar to many of the larger species of panic (Panicum species) grasses.   The height of this grass and the inflorescence (seed cluster) somewhat resemble domestic oats; thus, the common name “wood, creek, or sea oats.”  The weight of the seed heads causes the inflorescence to droop.


Known from Arizona to Florida and Michigan to New Jersey.  For current distribution, please consult the Plant Profile page for this species on the PLANTS Web site.


Adaptation: In Texas, this species is very common on loamy, terrace soils adjacent to creeks, bayous and rivers in eastern Texas, particularly under a hardwood forest canopy.  It becomes less common westward, although it is found under favorable conditions in the Edwards Plateau, Rio Grande Plains, and Southern Rolling Plains.  It is quite common in river bottoms of the Western Gulf Coast Prairie.  An abundance of Chasmanthium latifolium is usually a good indicator of a Class I or II soil; though, it will grow on wet natured clayey soils.  It is never found on droughty sites.  Some of the literature suggests that it is found in marshes and mud flats.  However, stress appears to limit the colonies to 1-3 plants on wet sites, rather than the 10-30 plant colonies commonly found on better-drained sites.

 General: There are 5-6 species of Chasmanthium in the U.S. and three in Texas.  All are generally associated with forested ecosystems, but none resemble Chasmanthium latifolium.  A similar species with regards to shade tolerance and vegetative growth habits, is savanna panic grass (Phanopyrum gymnocarpon).  Older references refer to this plant as Panicum gymnocarpon.  Phanopyrum occurs on very wet (ponded) sites and the inflorescence is completely different.  Virginia wildrye (Elymus virginicus) in east Texas and Canada wildrye (Elymus canadensis) further west, commonly occupies similar forested sites but the seed head remains upright and the leaves of wildrye are clustered much more towards the base.

The map below shows states where native Chasmanthium latifolium Northern Seaoats Inland SeaOats grass grows wild, it can be grown over a much wider area if planted.  Plant in USDA plant hardiness zones 2 to 9.

Chasmanthium latifolium
 Inland Sea Oats


New Jersey
New Mexico
North Carolina

South Carolina
West Virginia

State Distributional Map for Chasmanthium latifolium, inland sea oats, ricer oats

Use the chart below for shipping charges on native wildflower seeds

to order copy and mail the order form
 email questions, comments and orders to 

please email for shipping charges on ounce or pound quantities of grass seed.

Please contact us by email with your zip code and number of plants for shipping charges and availability on  potted plants

We accept payment by check, money order, and through Paypal

email for the correct shipping amount on orders containing ounce and pound quantities of grass seed

The shipping amounts below are for flower seeds and small packets of grass seed

please email for shipping charges on ounce or pound quantities of grass seed.

subtotal for flower seeds 

shipping charge for seeds

seed orders up to  $20.00    =  

 $4.00 shipping

$20.01 - $50.00    =  

 $6.00 shipping

$50.01-$100.00    =  

 $7.50 shipping

over $100.00    =    7.5 % of subtotal


Flower Pictures   Wildflower Seed and Potted Plant Price list    Order Form   

Easyliving Wildflowers
PO Box  522
Willow Springs,  MO.  65793
Phone 417-469-2611 

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Plant distribution map complements of USDA, NRCS. 2001. The PLANTS Database, Version 3.1
  ( National Plant Data Center, Baton Rouge, LA 70874-4490 USA.













Uniola latifolia Michaux; Indian woodoats, broad-leaf chasmanthium, northern sea oats, wild oats
Ornamental: Plant is used as ground cover in shady areas. Dried plants and seed heads popular for cut and dried arrangements. Plants used to accent open woodland gardens. In northern part of its range inland sea oats is used for texture and color contrast in plantings.
Wildlife: Inland sea oats is a minor component of the woodland habitat used as cover in open areas. The seed is used as food by birds and rodents. Some butterflies use the leaves as host for eggs.
Livestock: Cattle will graze inland sea oats, but accessibility and lack of abundance keep it from being and important forage species.
Erosion Control: Inland sea oats provides ground cover vegetation for critically eroding shaded areas, thus reducing soil erosion and improving water quality. Inland sea oats has proven salt tolerant and can prove useful in dune management where sunlight is not too intense.
Please consult the PLANTS website and your State Department of Natural Resources for this plant’s current status (e.g. threatened or endangered species, state noxious status, and wetland indicator values)
Inland sea oats is a rhizomatous clump forming perennial with characteristic drooping panicles. The plant can reach four feet in height, but is most often shorter. The leaf blades are broadly lanceolate (up to one inch wide at base) giving it the common name broad-leafed chasmanthium. Seed heads are borne in open panicles up to 10 inches long. The drooping panicles are initially green turning straw colored as seed ripen. Various shades of red sometimes occur as the fruiting spikelets mature.
Inland sea oats is found from Pennsylvania south through Florida, in the upper mid-west to Wisconsin and south through Iowa Missouri and Kansas. In the south this species ranges from Florida through Arizona.
Throughout its range, inland sea oats is found in moderate or greater shade. Its adaptation varies from moist to well drained sites in various parts of its range. It is never found on droughty sites. In the mid-west and north central states (region 3), this species is considered a facultative wet site species growing on deep moist well drained sites. In other regions of its range inland sea oats is variously rated as upland or facultative, which is indicative of the great adaptability.
This species may be propagated from seed as plugs or vegetatively by divisions or plugs. As an ornamental, place plants two to three feet apart along a garden border.
Inland sea oats is moderately tolerant of drought conditions within its range of adaptation, and will accept partial shade throughout most of its range. In northern parts of its range, inland sea oats is considered a moist site species. Plants will reseed and may become aggressive if not properly