Juncus roemerianus (Needlegrass Rush)

A dominant salt marsh species along much of the Atlantic and Gulf coasts, needlegrass rush tolerates a wider range of salinity than most brackish marsh plants and typically forms distinct, extensive vegetation zones - a defining structural species for tidal marsh restoration.

Species Overview

Juncus roemerianus, or needlegrass rush, is a perennial rush that forms dense, dark green to gray-green clumps in brackish coastal marshes. What appear to be sharp-pointed stems are actually stiff leaves rolled tightly into pointed, needle-like cylinders; the true flowering stems are tipped with inconspicuous inflorescences. It grows 3 to 5 feet tall and typically forms nearly pure, extensive stands.

Application

• Brackish and salt marsh restoration - a dominant, zone-forming coastal species
• Tidal marsh stabilization along river estuaries, extending up to 10-15 miles inland
• Coastal erosion control
• Wildlife habitat - attracts birds

Growing Conditions / Specification Data

• Light: Full Sun
• Soil/Moisture Tolerance: Wet clay or loam soils; brackish and salt marshes; tolerates a wide range of salinities, more so than most competing marsh plants
• Plant Type: Graminoid
• Mature Height: 4-8 ft.
• Fall Color: Insignificant/None
• Bloom Color / Period: Yellow, Green; May-October
• Wetland Indicator Status: OBL (Obligate Wetland)
• Native Range: New Jersey to Texas, with outlying populations in Connecticut and New York
• Hydrology: Wet
• Root Depth: Deep (24-36 in.) (deeply penetrating specialized roots, per earlier flood-tolerance research)
• Growth Rate: Moderate
• Drought Tolerance: Low
• Deer Resistance: Yes (Rarely Damaged)
• Shade Tolerance: Intolerant
• Salinity Tolerance: High - 0-40+ ppt broad tolerance; survives 90-360 ppt in hypersaline microsites via deep specialized roots (Eleuterius 1976 autecology study)
• Flood Tolerance: High - Dominant species of the regularly-inundated low-to-mid salt marsh zone; well documented as tolerating water-saturated, frequently flooded soils via deeply penetrating, specialized roots.
• Growth Habit: Spreading - rhizomatous, forms dense colonies
• USDA Hardiness Zones: 6-9
• Pollinator Value: None significant - wind-pollinated