Ornamental grasses that like shade: picks for low light

Most showy grasses demand full sun, but a few ornamental grasses that like shade hold their own in low light. Japanese forest grass is the standout, forming a cascading mound of bright green or gold that glows in a shaded bed. Sedges, which are grass-like though not true grasses, also handle shade well and tolerate the moist soil under trees. Northern sea oats takes part shade and adds dangling seed heads that catch the light. These plants bring movement and texture to a shade garden where bloom is scarce. I use ornamental grasses that like shade to break up the broad leaves of hostas and ferns with fine, arching texture. They want steady moisture rather than the dry, lean conditions sun grasses prefer, so I enrich the soil and keep the root zone damp through summer for the best color.

Why shade grasses are different

The shade-loving ornamental grasses evolved under different conditions than the prairie natives. Where switchgrass and little bluestem evolved on open ground with full sun and lean soil, the shade grasses evolved in woodland edges, moist meadows, and forest understories. They want part shade with morning sun or dappled light through trees, steady moisture through summer, and richer soil than the prairie natives tolerate.

This difference changes the care routine. The sun grasses want lean soil and no fertilizer. The shade grasses want compost-amended soil, regular water through summer, and a light annual mulch. The shade grasses also tend to be evergreen or semi-evergreen, which means they get a different cut or no cut at all.

The other big difference is heat. Most shade grasses evolved in cooler, moister conditions than the prairie, and they struggle in hot, dry shade under south-facing walls or in reflected heat. The north or east side of a building, with morning sun and afternoon shade, is the ideal site for most of the grasses in this article.

Japanese forest grass (Hakonechloa macra)

Japanese forest grass is my favorite ornamental grass for shade. Its cascading mound of arching blades looks more like a small bamboo than a traditional grass, and the variegated forms glow in shade where most grasses would sulk.

The plain green species (Hakonechloa macra) reaches 12 to 18 inches (30-45 cm) tall and 18 to 24 inches (45-60 cm) wide, with a graceful, arching habit that softens the edge of a bed or container. Hardy in USDA zones 5 to 9, it tolerates part shade with morning sun and steady moisture. The Missouri Botanical Garden Plant Finder rates it as one of the best ornamental grasses for shade, and it has won the Royal Horticultural Society Award of Garden Merit.

‘Aureola’ is the gold-variegated cultivar that most gardeners grow. Its 12 to 18 inch (30-45 cm) mound has bright gold blades with thin green stripes, and the color is most intense with morning sun. In too much shade the variegation fades. In too much sun the gold leaves scorch. The sweet spot is 3 to 4 hours of morning sun followed by afternoon shade.

‘All Gold’ is the fully gold version, even brighter than ‘Aureola’ but more sun-sensitive. It needs the same morning sun, afternoon shade conditions, and slightly more moisture to keep from scorching.

‘Albo Striata’ is the white-variegated cultivar, with cream-and-green striped blades. It is more shade-tolerant than the gold forms and holds its variegation better in lower light.

Japanese forest grass is one of the few ornamental grasses that asks for richer soil. I amend the planting bed with 2 to 3 inches (5-7.5 cm) of compost before planting, and I mulch with shredded leaves to keep the roots cool and moist. Watering through dry spells is essential, since the plant wilts visibly when it gets too dry and the leaf tips crisp.

Sedges (Carex spp.)

Sedges are grass-like plants that handle shade better than almost any true grass. They are not technically ornamental grasses, but they fill the same role in the garden and are often listed alongside grasses in plant catalogs and trial reports.

Pennsylvania sedge (Carex pensylvanica) is the native lawn alternative for dry shade. It forms a 6 to 12 inch (15-30 cm) mat of fine-textured green blades that spreads slowly by rhizome, filling in around tree roots where lawn grass fails. Hardy in USDA zones 3 to 8, it tolerates the dry, rooty conditions under oaks and maples better than almost any other ground cover. The Lady Bird Johnson Wildflower Center recommends it as the top native lawn substitute for shade in the eastern US.

Japanese sedge (Carex morrowii) and its close relatives form 12 to 18 inch (30-45 cm) evergreen clumps in part shade. Hardy in USDA zones 5 to 9, they handle moist shade under trees better than Pennsylvania sedge and stay green through winter in mild zones. ‘Silver Sceptre’ is a popular variegated cultivar with cream-and-green striped blades.

Carex oshimensis ‘Evergold’ is the variegated sedge I reach for first in shade. Its 12 to 18 inch (30-45 cm) clump of narrow, arching blades has a cream center with green edges, and it holds its color through winter in zones 6 to 9. It is less cold-hardy than C. morrowii, rated only to zone 5, but worth the protection in a sheltered spot.

Sedges are evergreen or semi-evergreen, which means they need a different cut than warm-season grasses. Rather than shearing in late winter, I comb out the dead blades by hand with a small rake or gloved fingers. Cutting evergreen sedges to the ground can damage the growing point and weaken the plant.

Northern sea oats (Chasmanthium latifolium)

Northern sea oats is a North American native that handles part shade better than almost any true grass. Its 2 to 4 foot (60-120 cm) upright clump of bamboo-like blades produces dangling, oat-like seed heads in late summer that turn coppery in fall and persist through winter. Hardy in USDA zones 3 to 8, it survives Minnesota winters and Maine winters without protection.

The seed heads are the show. They dangle from the upright stems on thin threads, catching the light and moving in the slightest breeze. By September they have turned from green to copper, and they hold that color through the winter, rattling in the wind. They are also useful in dried arrangements.

Northern sea oats self-seeds modestly in moist conditions. The seedlings are easy to spot and pull, but in a moist shade bed they can become a maintenance chore. I deadhead the seed heads in late fall before they shatter to prevent unwanted seedlings, though I leave a few for the birds.

Tufted hair grass (Deschampsia cespitosa)

Tufted hair grass is a cool-season native that handles part shade and produces airy flower panicles in June that catch the light like a haze over the clump. Hardy in USDA zones 4 to 9, it reaches 2 to 4 feet (60-120 cm) tall and forms a tight evergreen clump of narrow, dark green blades.

The flowers are the show. They open in June as a fine mist of gold and silver over the clump, and they persist through summer, catching the light differently through the day. ‘Northern Lights’ is a variegated cultivar with cream-and-green striped blades that brighten a shade bed. ‘Goldtau’ has more golden flower panicles than the species.

Tufted hair grass wants steady moisture and good drainage. It will not tolerate soggy roots, but it does not like dry conditions either. A moist, well-drained site with part shade and morning sun is ideal.

Care differences from sun grasses

The shade grasses break almost every rule that applies to the sun grasses. The sun grasses want lean soil. The shade grasses want rich, compost-amended soil. The sun grasses want no fertilizer. The shade grasses benefit from a light annual compost top-dress. The sun grasses want sharp drainage and resent moisture. The shade grasses want steady moisture through the growing season.

These differences come from evolution. The sun grasses evolved on dry, lean prairie. The shade grasses evolved in moist, leaf-littered woodland. Matching the care to the plant’s evolved conditions is what makes both groups thrive.

Mulch is more important for shade grasses than for sun grasses. A 2 to 3 inch (5-7.5 cm) layer of shredded leaves or fine bark keeps the roots cool, holds moisture, and adds the organic matter these plants want. I refresh the mulch each spring.

Watering is also more important. The sun grasses want water only during establishment. The shade grasses want supplemental water through dry spells, especially under trees where the tree roots compete for moisture. I check the soil moisture every week in summer and water deeply if the top inch (2.5 cm) is dry.

Designing with shade grasses

The shade grasses shine in combinations with the traditional shade plants. The fine texture of Japanese forest grass sets off the broad leaves of hostas and the soft fronds of ferns. The cascading habit of Hakonechloa softens the edge of a bed or container, where it can spill over a wall or path.

Sedges work as a ground cover under trees, where lawn fails and most flowers cannot compete with tree roots. A drift of Pennsylvania sedge under a maple is one of the lowest-maintenance plantings in a shade garden.

Northern sea oats adds height and a different texture to a shade bed. The dangling seed heads catch morning light in a way few shade plants can match. Pair it with bold-leaved plants like bergenia or rodgersia for contrast.

The key in every case is to match the grass to the moisture and light conditions. Dry shade under oaks calls for Pennsylvania sedge. Moist shade under maples calls for Japanese forest grass or Japanese sedge. Part shade with morning sun calls for northern sea oats or tufted hair grass. The right grass in the right shade conditions outperforms the wrong grass in any shade.