Norfolk Island hibiscus
Regional Pest Management Plan (RPMP) status
- Parkland with Significant Ecological Areas — Site-led
- Whole region — Sustained control
- Waitākere Ranges Heritage Area priority status
- Hauraki Gulf Controlled Area Notice pest
Evergreen tree < 15 m tall. Flowers are white/pink and borne predominantly in September – April. Seed capsules are five-valved and borne year-round.
What you need to know
To help protect our environment:
- You must not breed, distribute, release or sell Norfolk Island hibiscus within the Auckland region.
- You must not plant Norfolk Island hibiscus 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 Norfolk Island hibiscus 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.
Coastal habitats, dunes, cliffs, scrub, mangroves.
Seeds dispersed by water and gravity. Human-mediated dispersal through dumping of garden waste and deliberate plantings.
Impact on environment
Potential to compete with native plants.
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.
Method: Dig out.
Plant parts requiring disposal: Seeds.
Disposal options: Remove to greenwaste or landfill if practical.
Biocontrol is currently not available for this species.
Community agrichemical control recommendations
No qualifications: Cut stump and paste freshly cut base of stems with metsulfuron gel or ringbark stem and paste with metsulfuron gel.
Basic Growsafe certified: Cut stump and spray freshly cut base with 5g metsulfuron-methyl per 1 L of water.
Certified Handler/Experienced agrichemical user: Drill and inject trees with 10g metsulfuron-methyl per 1L of water if safe to do so. Drill 18mm holes (tangentially angled downwards) in a spiral up the trunk. For 50mm stems drill one hole. For 100mm stems drill two holes. For larger stems drill holes 150mm apart. Foliar spray seedlings with 5g metsulfuron-methyl per 10L of water and 20ml penetrant.
Large trees must not be drilled that are closer than 1.5 times the height of the tree from paths, walkways and property.
Trees over 4 metres in height should be removed by a qualified arborist.
Caution: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.