Japanese Forest Grass

Japanese Forest Grass (Hakonechloa macra)

Hakone Grass

Part to full shade, medium to moist, prefers fertile, humus-rich, well-drained loam, pH 5.5–7.0; intolerant of waterlogged conditions or full-day sun.

30–50 cm tall by 45–60 cm wide; warm-season grass forming gracefully cascading mounds; inconspicuous flower panicles in late summer; foliage turns bronze-orange in fall. Growth rate slow, eventually spreading by short rhizomes into clumps.

Native region: Not native to Tennessee; ornamental introduction from Japan (Mt. Hakone region).

H. macra is among the most widely used shade ornamental grasses in American horticulture. The golden-variegated cultivar 'Aureola' is the most commonly sold selection in Middle Tennessee nurseries. This species is genuinely shade-dependent — more than a half-day of direct sun in Zone 7a bleaches the foliage and causes tip-scorch in summer heat; afternoon shade is non-negotiable. In Columbia's clay-heavy soils, amend beds with significant organic matter before planting; poorly drained clay does not suit this species. Slow establishment rate is the most common gardener complaint — plants may show minimal spread for 2–3 seasons before filling in. No significant insect or disease problems in properly sited plantings. Attracts UT Extension attention as a reliable ornamental grass for the shaded perennial border.