Montbretia

Family:
Iridaceae
Origin:
Africa

General description

Stiff, leafy, clumping perennial <90cm tall. Erect, sword-shaped, light green leaves with conspicuous mid-vein. Reddish-orange, trumpet-like flowers (Jan-Feb) opposite each other in a zigzag pattern on the stem. Small, green, 3-sided seed capsules.

Roadsides, waste areas, streambanks, forest margins, flood plains, slips.

Seeds spread by water, animals & machinery. Locally spread from corms and garden debris.

Covers large areas of open streamside. Displaces natives such as kiokio & streamside herb communities.

Site management

Sites regenerating to canopy over 2 m can normally be left alone, may benefit from thinning where weed is dense. Target areas that could infest streams & follow up to prevent reinfestation (work down stream). Replant with dense groundcover where appropriate. Check soil or road metal sources for contamination.

Recommended approaches

1. Dig out very small sites. Usually futile in large sites as corms resprout.
2. Weed wipe at full leaf stage (1g metsulfuron + 100ml glyphosate + 1ml penetrant/1L).
3. Spray foliage after flowering (100ml glyphosate/10L). Will require retreatment.
4. Spray at full leaf stage (100ml glyphosate + 4g metsulfuron + 10ml penetrant/10L).

Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.

Similar species

aristea
Aristea ecklonii

Aristea has blue flowers and has several prominent parallel veins on leaves

wild gladiolus
Gladiolus undulatus

Wild gladiolus has a deep red-purple sheath that wraps around the base of the leaves.

bulbil watsonia
Watsonia bulbillifera

Bulbil watsonia is a larger more robust plant. It's leaves are tough and upright. It has tall flower stalks which develop aerial corms.

RPMS status

Surveillance - Whole Region
montbretia - Main species image