Juncus gerardii Blackgrass

General

A perennial rush species native to coastal regions of North America, known for its adaptation to brackish and saltwater environments. It typically grows 1 to 3 feet (about 0.3 to 0.9 meters) tall and forms dense clumps of slender, dark green stems. This rush plays a crucial role in stabilizing coastal wetlands and providing habitat for a variety of salt-tolerant wildlife.

Plant Description

Features erect stems that are slender and dark green, with narrow leaves arranged alternately along the stem. Its inflorescences are compact and cylindrical, bearing small, greenish-brown flowers. Black needle rush has a distinctive appearance in coastal habitats, where its dense growth and dark coloration contribute to the resilience and biodiversity of salt marsh ecosystems.

Height (ft)
1-3'

Soil moisture
Moist to wet

Soil types
Sandy or silty soils

Wetland indicator
OBL

Shade tolerance
Intolerant, Full Sun

Bloom color
Green/brown

Bloom period
Late spring to early summer

Drought tolerance
Moderate

Salinity tolerance
Moderate to high

 

Range

Distributed along the eastern and Gulf coasts of North America, from the Gulf of St. Lawrence in Canada to Florida and westward along the Gulf Coast into Texas.

Kartesz, J.T. 2024. Floristic Synthesis of North America, Version 1.0. Biota of North America Program (BONAP) [website http://bonap.org/]

Additional Information