River Oats
Chasmanthium latifolium
Flat, oat-like seedheads sway on arching stems, green in summer, copper-bronze in fall. The shade-tolerant grass people stop to ask about.
Typically 1 pint–1 gal · $9–$30 · final price at pickup
- Thu, Aug 138 AM – 4 PM
- Fri, Aug 148 AM – 4 PM
- Sat, Aug 158 AM – 2 PM
Those dangling, flat seedheads are the most distinctive texture in any shade garden, and birds love them through winter.
River Oats is the grass that makes people stop and ask what it is. Flat, oat-like seedheads dangle from fine, arching stems and sway at the slightest movement, individually small but collectively hypnotic when massed. They emerge green in summer, turn a warm copper-bronze in fall, and persist well into winter with surprisingly good structure for a shade-tolerant grass. Plant it along shaded paths, beneath deciduous canopy, or at the edge of a rain garden where moisture collects. It naturalizes readily by seed, spreading gently to fill in bare ground under trees where little else will grow. The broad, bamboo-like blades catch filtered light in a way that adds real life to darker garden corners. Songbirds, especially Cardinals and Goldfinches, strip the seedheads in fall and winter. Cut it back in late winter to about 4 inches before fresh growth emerges. Once established, River Oats is essentially self-sufficient in moist to average shaded conditions.
A nursery-grown plant, ready for the ground.
Healthy, container-grown river oats propagated on-site at Hill House from regional genetics. Includes a one-page care card. We make every effort to supply plants as listed; occasionally we substitute a similar species of equal value.
Plant river oats instead of Japanese stiltgrass (Microstegium vimineum). Same job in the garden, without the spread.
- Sun
- Part sun
- Water
- Average
- Mature size
- 2–4 ft · 18–30 in wide
- USDA zones
- 5–9
- Family
- Poaceae
- Native range
- Eastern and central North America, from Pennsylvania south to Florida and west to Kansas and Texas
Care notes for river oats.
Plant in part shade to full shade in average to moist soil. Tolerates clay and periodic flooding. Spreads by self-seeding. manage by deadheading if you want to limit spread, or let it naturalize freely. Cut back to 4 inches in late winter. No fertilizer needed; rich soil promotes vigorous spread.
Pairs well with these.
Same light, same soil, same wildlife. Janet's picks to plant alongside river oats.
Or skip the guesswork.
Curated packages bundle complementary species for an instant habitat. One reservation, one pickup day, a printed layout map.
Short on Space Package
For gardeners who have an abundance of passion but are short on space, this package features tidy, upright, clump-forming natives that behave and function well in small spaces.
Shade Bed Package
Ferns, sedges, and woodland natives that thrive under existing trees.
Birder’s Paradise Package
For the avid bird watchers and budding ornithologists in our community, the Birder’s Paradise Package consists of species that Hill House Nursery staff and longtime native plant advocates such as Doug Tallamy consider ‘premier bird garden plants’.