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// SPECIES PROFILE · GRASS · NATIVE

Inland Sea Oats

Chasmanthium latifolium

Inland sea oats is the rare ornamental native grass that thrives in shade — bamboo-like upright stems hung with flat green oat-like seedheads in summer that ripen to bronze-copper and persist through winter, rustling at the lightest breeze.

// QUICK FACTS
Family
Poaceae
Group
grass
Native range
E. & C. US incl. eastern OK woodlands
USDA hardiness
Zones 3–8
Mature size
2–4 ft
Sun
Part shade to shade
Water
Average; tolerates dry shade
Wildlife value
Larval host for several satyr butterflies; seeds for finch + sparrow
Ecological role
shade-tolerant native grass · ornamental seedheads
Inland Sea Oats (Chasmanthium latifolium)
Chasmanthium latifolium. Photo via Wikipedia / Wikimedia Commons.

Field Notes

[ growing · ecology · siting · care ]

Self-sows generously — site where you want a colony, or remove some seedheads in fall to limit spread. The single best native ornamental grass for shaded gardens in eastern Oklahoma.

Why it's on this list: shade-tolerant native grass · ornamental seedheads. Part of Rooted Revival's NE Oklahoma plant catalog — natives, ecologically positive non-invasive cultivars, and food crops worth growing in the Tulsa region.

Companion Planting

[ guild · polyculture · cross-layer pairings ]

In a shaded woodland understory, inland sea oats pairs naturally with: american hornbeam (Carpinus caroliniana), american beautyberry (Callicarpa americana), crossvine (Bignonia capreolata), cardinal flower (Lobelia cardinalis), eastern gamagrass (Tripsacum dactyloides), and black tupelo (Nyssa sylvatica).

Interplant inland sea oats as a structural matrix between forbs to mimic native prairie architecture.

Photo Reference

Chasmanthium latifolium — natural habitat
// Chasmanthium latifolium — natural habitat
Photo: rreams (iNaturalist, CC BY-NC)
Chasmanthium latifolium — flower & foliage
// Chasmanthium latifolium — flower & foliage
Photo: rreams (iNaturalist, CC BY-NC)
Chasmanthium latifolium — habit
// Chasmanthium latifolium — habit
Photo: tntreehugger2 (iNaturalist, CC BY-NC)
Chasmanthium latifolium — field view
// Chasmanthium latifolium — field view
Photo: tntreehugger2 (iNaturalist, CC BY-NC)
Chasmanthium latifolium — close-up detail
// Chasmanthium latifolium — close-up detail
Photo: tntreehugger2 (iNaturalist, CC BY-NC)

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