Daggerleaf Rush

Juncus ensifolius (Juncaceae) is a rhizomatous rush native to western North America from Alaska to central Mexico, with disjunct populations in eastern Canada, Japan, and the Russian Far East. It grows to about 2 feet tall and spreads at a moderate rate by rhizomes. The species produces purple flowers, green sword-shaped foliage, and brown fruit capsules.

Daggerleaf rush is a true wetland emergent, adapted to saturated soils in seeps, springs, riparian zones, stream margins, and pond banks. It requires consistently high moisture and tolerates a pH range of 6.0 to 8.0 in sun to part shade. Minimum root depth is about 11 inches. Drought tolerance is low. The species serves restoration and rain garden plantings where a native, low-maintenance rush is needed for permanently wet sites. Hardy in Zones 3b to 9b.

Native throughout western Washington. Common in wet meadows, stream margins, and bog edges. Excellent choice for rain gardens and bioswales in Puget Sound lowlands. Tolerates the heavy clay soils typical of the Kent valley when saturated. Generally pest-free and disease-resistant in this region.