Pukenui Forest
Invasive Plants & Pests

Invasive plants and pests that threaten the forest

Protecting vulnerable native species

Aotearoa’s unique native species evolved for millions of years without introduced predators or invasive plants. Today, many pest species are found across the country, including in Pukenui and Western Hills Forest. Without active pest management, these invaders can overwhelm native biodiversity.

If you spot any unusual pest species in Pukenui Forest, please contact us immediately.

Pest animals

Pukenui Forest has long been impacted by introduced predators and herbivores. Active pest control is vital to protect native plants and wildlife.

The most common pest animals and their impacts:

  • Possums: Strip leaves from native trees, threatening survival. Control efforts have allowed trees like kohekohe to flower and set seed again.
  • Stoats: Highly intelligent predators that hunt birds like kiwi and threaten chicks. Trapping programs aim to restore safe habitats.
  • Rats: Eat seeds, fruit, insects, and bird eggs, reducing native bird populations.
  • Feral cats: Apex predators posing ongoing risks to wildlife.
  • Goats: Devour understory plants, preventing forest regeneration. Eradication programs have removed hundreds of animals.

The Trust has successfully eradicated feral goats and pigs and continues intensive trapping and baiting lines to target possums, rodents, and mustelids. Collaboration with neighbouring landowners supports a Predator Free Aotearoa vision.

Myrtle rust

The fungal disease myrtle rust affects plants in the myrtle family, including iconic species such as pohutukawa and manuka. While it thankfully has not yet spread widely in Pukenui Forest, awareness is important. If you see suspicious symptoms:

  • Do not touch the plant
  • Take a photo and contact MPI on 0800 80 99 66

For more information, visit the MPI website.

Invasive plants

Pukenui Forest borders the city of Whangārei, and over time many garden plants have ‘jumped the fence’ into the forest. Common invasive plants include:

  • Ginger
  • Climbing asparagus
  • Taiwan cherry
  • Climbing asparagus
  • Bangalow palms

These plants can:

  • Form dense mats that prevent seedling trees from establishing
  • Grow faster than native trees in light wells, dominating cleared areas
  • Alter food sources for native birds and insects

Whangārei District Council works on weed control in Coronation Park, and local volunteers help manage invasive plants along the forest edge. You can make a difference by forming a Weedbusters group with neighbours or friends.

How you can help the forest thrive

Every effort counts towards a healthier forest ecosystem. You can get involved by signing up as a volunteer and help with pest control, weed removal, and habitat restoration. Or you can donate to support ongoing conservation work and native species protection.