Californian Bulrush

Also known as:
Californian Bullrush
North America

General description

Dense, clumping, rhizomatous rush < 4 m tall. Stems are triangular. Flowers are small, brown and borne in drooping inflorescences in November – April. Nuts are small and cream/grey.

What you need to know

To help protect our environment:

  • You must not breed, distribute, release or sell Californian bulrush. As Californian bulrush is a National Pest Plant Accord species, these restrictions apply within the Auckland region and across the whole of New Zealand.
  • You must not plant Californian bulrush within the Auckland region, unless you are transferring an existing plant on your land to another location within the boundaries of the same property.
  • You must destroy any Californian bulrush 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.

Brackish riparian margins and estuaries, drainage ditches, pasture.

Vegetative spread from rhizomes, dispersed by water.

Forms dense stands, excluding native sedge species. Potential to alter soil conditions by stabilising sand bars and river margins.

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

Physical control

Method: Dig out

Plant parts requiring disposal: All parts

Disposal options: Remove to greenwaste or landfill if practical


Biocontrol is currently not available for this species.

Community agrichemical control recommendations

No qualifications
Foliar spray with 100ml glyphosate green per 10L of water

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

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

RPMP status

National Pest Plant Accord Species
Whole region (Sustained Control)
Californian bulrush - Main species image