Sharp Rush

Family:
Juncaceae
Origin:
Africa, Europe, North America

General description

Perennial, spiny, clump-forming rush < 1 m high. Rhizomes are woody. Stems are cylindrical and sharp-tipped. Leaves have sharp tip. Flowerheads are clumped, green/brown and borne near the end of each stem in summer. Fruit capsules are red/brown/orange and borne in autumn.

What you need to know

To help protect our environment, from 1 September 2021:

  • You must not breed, distribute, release or sell sharp rush on Aotea/Great Barrier Island group.
  • You must not plant sharp rush on Aotea/Great Barrier Island group.
After the RPMP has been operational for one year, you:
  • will not be allowed to breed, distribute, release or sell sharp rush within the Auckland region.
  • will not be allowed to plant sharp rush within the Auckland region, unless you are transferring an existing plant on your land to another location within the boundaries of the same property.
  • must destroy any sharp rush on land that you occupy if it has been planted in breach of the above rules and you are directed to do so by an authorised person.
If you see sharp rush on Aotea/Great Barrier Island group, please report it to Auckland Council at pestfree@aucklandcouncil.govt.nz.

Salt marshes, mudflats, wetlands, damp scrub, lake margins, pasture, roadsides.

Seeds dispersed by water and soil movement. Vegetative spread from rhizomes. Human-mediated dispersal through movement of contaminated machinery and soil.

Forms dense stands, displacing native salt marsh vegetation and suppressing recruitment. Reduces native plant richness and alters invertebrate communities.

Site Management

Follow up treated areas 3 times per year. Encourage natural regeneration of native plants or replant treated areas where possible after 2-3 treatments to establish dense ground cover and minimise reinvasion.

Recommended approaches

Do not attempt to undertake control of this species on Aotea/Great Barrier Island group. Please report to Auckland Council if seen on Aotea/Great Barrier Island group.

Physical control

Method: Dig out

Plant parts requiring disposal: Seeds and rhizomes

Disposal options: Remove to greenwaste or landfill

Biocontrol

Biocontrol is currently not available for this species.

Community agrichemical control recommendations

No qualifications
Foliar spray with 100ml glyphosate green per 10L of water in spring and summer

Certified Handler/Experienced agrichemical user
Foliar spray with 100ml glyphosate green per 10L of water and 20ml penetrant in spring and summer

CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.

RPMP status


Whole region (Sustained Control)
Parkland with Significant Ecological Areas (Site-led)
Aotea (Exclusion)
Waitākere
Hauraki Gulf Controlled Area Notice pest
Sharp rush - Main species image