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Spike Rush
Eleocharis acicularis

About Spike Rush (Eleocharis acicularis) Eleocharis acicularis is a species of spikesedge known by the common names needle spikerush and dwarf hairgrass. It has a circumboreal distribution and it can also be found throughout the rest of the Americas. It lives in Australia, where it was probably an introduced species. This is an annual or perennial spikesedge with long, grasslike stems to about 15 centimeters in height, shorter in bog conditions, from a creeping rhizome. In shallow water it will form short spikes of tiny flowers amongst flat overlapping leafs. The tiny flowers are less than five millimeters in diameter and are borne at the tip of each stem in single, sharply pointed, lanceoloid spikelets up to about six millimeters long. This is a plant of marshes, vernal pools, and bogs, and it is also used as an aquarium plant. It thrives with plenty of light and a high concentration of carbon dioxide.
Plant Description
Plant Type

Max. Height
5.9 - 8.4 in (15 - 21.3 cm)


Growth Rate

Flower Color

Flowering Season

Native Status

Natural Setting
Site Type
Marshes, meadows, riverbanks and vernal pools

Sun, Part Shade

Elevation ?
-234' - 10562'

Annual Precip. ?
2.6" - 115.0"

Summer Precip. ?
0.13" - 3.43"

Coldest Month ?
20.2° F - 58.4° F

Hottest Month ?
44.7° F - 88.8° F

Humidity ?
0.09 vpd - 39.38 vpd

Soil Description
Prefers loamy or clay soils. Grows poorly in sandy soils.


Landscaping Information
Common uses
Bird Gardens

Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Dwarf Hairgrass, Needle Spikerush

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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