Cumberland Reed Grass is a striking native riverine sandgrass native to a tiny, scattered range across the Cumberland Plateau and beyond. This clumping perennial reaches 36 to 48 inches tall and wide, thriving in the full sun and moist to wet soils of rain gardens and stream-adjacent landscapes. Hardy in zones 6 through 8, it produces insignificant flowers in late summer through early fall and tolerates wet conditions that would challenge most ornamental grasses. Its rarity in cultivation and ecological importance make it a compelling choice for gardeners committed to native plant conservation.
Full Sun
Moderate
6-8
48in H x 48in W
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High
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Cumberland Reed Grass survives in one of the narrowest native ranges of any American grass species, clinging to sun-exposed rocky streambeds in Kentucky, Tennessee, northern Alabama, and scattered populations in southeastern Oklahoma and western Arkansas. In the garden, it forms dense, attractive clumps that can spread naturally by rooting at the nodes, offering dynamic movement without aggressive invasiveness. Its tolerance for wet soil and moist conditions opens doors to rain gardens and riparian restoration projects where conventional ornamentals struggle, making it both ecologically meaningful and visually distinctive.
Cumberland Reed Grass shines in rain gardens and wetland restoration projects where it can anchor soil along stream margins and wet depressions. Its tolerance for moist to wet conditions and full sun makes it valuable in bioswales, rain gardens, and native planting schemes designed to mimic riparian habitat. Beyond ecological function, the grass adds seasonal interest to the garden as its clumps take on warm tones in late summer and fall, providing texture and movement during the August and September bloom period.
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Cut Cumberland Reed Grass back to ground level in late winter to early spring to refresh the clumps and remove accumulated dead material. This timing allows the plant to regrow fully before the growing season begins and bloom period arrives in August.
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“Cumberland Reed Grass exists in a precarious ecological position that makes its story inseparable from conservation. In the wild, this sandgrass is confined to flood-scoured exposures of bedrock, cobble, and gravel along small rivers and streams on the Cumberland Plateau, where freely flowing unpolluted water maintains the specific habitat this species requires. Its survival in natural populations depends entirely on intact streambanks and unaltered water flow; the construction of reservoirs, dams, or any modification of stream channels threatens the cobble bars and plant communities that support it. This vulnerability transforms Cumberland Reed Grass from a simple ornamental into a living link to healthy, undammed river systems and an opportunity for gardeners to support biodiversity by growing it in appropriate settings.”