Chatham Island Toetoe

Botanical name: Austroderia turbaria
Synonyms: Cortaderia turbaria
Common name(s): Chatham Island toetoe

About:
A rare wetland toetoe endemic to the Chatham Islands and one of New Zealand’s most threatened native grasses. Distinguished by its hairy leaf sheaths, drooping dense plumes, and hermaphrodite flowers.

Natural habitat:
Occurs naturally around peat bogs, swamp forest light wells, lake margins, and slow-flowing wetland streams on Chatham and Pitt Islands.

Growing environment:
Full sun to light shade, Permanently damp soils, Acidic peaty ground, Frost tolerant & Wind sheltered.
Requires consistently moist conditions and performs poorly in drought-prone sites.

Endemic distribution:
Endemic to the Chatham Islands of New Zealand.
Naturally restricted to Chatham and Pitt Islands.

Height:
Approximately 1.5–2 m tall when flowering

Width:
Forms dense tussocks approximately 0.5–1 m across

Flowering:
Spring to mid-summer
Dense creamy drooping plumes produced from October through January.

Fruiting:
Summer to winter
Seed develops from December through July.

Uses:

• Wetland restoration
• Peatland revegetation
• Ornamental native grass
• Erosion control
• Conservation plantings
• Habitat restoration

Appearance:

Growth habit:
A graceful tussock-forming wetland grass with arching foliage and soft nodding plumes.

Leaves:
Leaves are glaucous green, tapering, softly arching, and notable for their conspicuously hairy leaf sheaths and hairy undersides.

Flower plumes:
Produces elegant drooping cream-coloured plumes with densely hairy flowering branches.

Seed heads:
Feathery wind-dispersed seed heads persist well beyond flowering.

Ecology:
A highly specialised wetland species associated with sphagnum bogs, swamp forest margins, peatland streams, and permanently damp acidic soils.

Associated habitats:
Frequently grows with sphagnum moss, sedges, peatland shrubs, swamp forest species, and wetland herbs.

How to grow:
Best grown in full sun or light shade in permanently moist, acidic, peaty soils. Requires reliable moisture year-round and benefits from sheltered conditions.

Propagation:
Easily grown from fresh seed while viability remains high. Seed should be sown fresh, as stored seed rapidly loses viability. Can also be propagated by division of young clumps.

Threats:
One of New Zealand’s rarest native grasses. Threatened by browsing stock, pigs, sheep, trampling, wetland drainage, invasive vegetation, flooding, fire, fungal disease, and hybridisation with introduced toetoe species.

Conservation status:
Nationally Critical.
Known from very few fragmented populations with only a small number of mature plants remaining in the wild.

Cultural significance:
An important component of Chatham Islands ecological and cultural heritage. Historically used in small-scale weaving and traditional craftwork by Moriori communities.

Garden value:
An outstanding and unusual wetland toetoe suited to specialist native gardens, peatland restoration projects, and conservation collections. Particularly valuable for recreating authentic Chatham Islands wetland ecosystems.