Juncus effusus

Species Native to Missouri
Common Name: common rush 
Type: Rush or Sedge
Family: Juncaceae
Native Range: Eurasia, North America, Australia, New Zealand
Zone: 4 to 9
Height: 2.00 to 4.00 feet
Spread: 2.00 to 4.00 feet
Bloom Time: June to August
Bloom Description: Yellowish-green
Sun: Full sun
Water: Wet
Maintenance: Low
Suggested Use: Water Plant, Naturalize, Rain Garden
Flower: Showy
Tolerate: Erosion, Wet Soil


Easily grown in moist to wet soils in full sun to part shade. Best in full sun. Performs well in standing water to 4” deep, but will also grow well in garden soils as long as the soils are in fact kept consistently moist. Plants will spread in the landscape by rhizomes and by self-seeding. Rhizomatous spread may be controlled, if desired, by growing this plant in large containers sunk in the ground. Foliage remains evergreen in warm winter climates or when grown indoors as a houseplant. In St. Louis, outdoor clumps die to the ground in winter. Old foliage should be cut back in early spring. Propagate by seed or division.

Noteworthy Characteristics

Juncus effuses, commonly known as soft rush, common rush, bog rush or mat rush, is a grasslike-like, rhizomatous, wetland perennial that features smooth, upright, cylindrical, unjointed, spire-like green stems (leaves are absent) which grow in spreading basal clumps to 20-40” tall. It is one of the true rushes. It has a nearly cosmopolitan distribution, being found in many places around the world, but primarily in cool-temperate regions, particularly ones having wet soils. It is often found growing in ditches, bogs, swamps, marshes, wet pastures, and along the margins of lakes and rivers. It is infrequently found growing in tropical areas. Stems are usually solid, with the leaves typically reduced to bladeless basal sheathes. Insignificant, minute, yellowish-green to pale brown flowers bloom in one-sided clusters (many-flowered cymes) located on stem sides slightly below the stem tips. Flowers emerge in summer (July to September). Fruit is an obovoid capsule. Clumps provide vertical accent to moist garden areas. Although the stems appear from a distance as coarse and stiff, they are soft to the touch. Soft rush is considered to be a somewhat invasive weed in a number of locations. Foliage turns yellow in fall before browning up for winter.

Genus name means rush.

Specific epithet means loose-spreading in probable reference to plant habit.


No serious insect or disease problems. Rust, leaf spot and stem rots may occur.


Except for certain horticultural varieties, straight species plants are typically not grown as garden plants. They may be grown at the edge of a pond or water garden, in boggy areas, among wet pebbles or rocks or in several inches of standing water. Good water garden accent. Effective in containers. Interesting plant for transitional waterside areas. May help control soil erosion on moist banks.