Brad Smith and Erica Weblin from Environment Canterbury talk about the Perpetual Forestry Project.

The challenge

The Canterbury Plains have lost more than 99% of native vegetation since colonisation. That makes the remaining native trees precious. These trees are living relics of the past. Protecting them is vital for the region’s biodiversity.

The Perpetual Forestry Project

Environment Canterbury (ECAN) manages over 3,000 hectares of commercial forestry. Much of the forest estate is open to the public for activities such as mountain biking and running.

ECAN’s Brad Smith says within those 3,000 hectares there are tracts of native vegetation that need protecting.

In 2021, ECAN launched the Perpetual Forestry Project. The project protects and restores native forests of kōwhai and kānuka within these commercial blocks. One of the largest sites is at McLeans Island, within Waimakariri River Regional Park. The park is about 15 minutes outside of Christchurch.

Brad says, “You can actually use the commercial forestry block, and the value that the trees can provide in terms of shelter, as a mechanism to gain that successful establishment when it comes to native plantings.”

Why plant natives in commercial forests?

The project has 4 main goals:

  • Protect native remnants: Safeguard the plucky kōwhai and kānuka that have survived in the commercial forests.
  • Establish buffer zones: Plant new natives around these remnants to shield them from harm.
  • Link native remnants: Create corridors that connect patches of native forest, helping birds, insects, and lizards to thrive.
  • Encourage biodiversity: Protect and bolster native plants and animals in the forest estate.

How it works

ECAN’s Erica Weblin says the first step was to find and map the native remnants in the forest estate. 

“There was a need to identify the remnant native areas in the commercial forest estate and make sure that we were protecting those.” 

ECAN then started planting native seedlings. The 4,200 seedlings planted at McLeans Island in 2022 were made up of:

  • shrubs, such as corokia and mānuka
  • grasses such as toetoe
  • trees, including 100 tōtara and 400 mānatu (ribbonwood). 

In other areas, shade-tolerant natives were planted under the pine canopy. The shelter provided by the commercial trees has helped to establish the native plants. Over time, these new plantings will create more seed sources and help native ecosystems sustain themselves. 

Challenges along the way

Pests! Rabbits and hares have been a problem, eating young seedlings. The team uses biodegradable guards or rabbit-proof fencing to protect new plants.

What’s working

  • Emissions Trading Scheme (ETS) registration: Planting more native trees to register the forest in the ETS, creating extra income.
  • Fast growth: Shade-tolerant natives like māhoe, makomako, and griselinia can grow quickly under pine trees. 

Erica says protecting and expanding native remnants is important for biodiversity. Existing plants provide a seed source for native plants to regenerate in the vicinity.

Erica says planting natives is creating habitat in the short term. 

“But then, in the long term, we're really hoping that it's going to be creating more seed sources that are sort of scattered throughout the forestry estate. The goal is to really be able to facilitate that natural process anyway and sort of create ecosystems that can sustain themselves.” 

Lessons learned

  1. Having more native forests near Christchurch helps people feel connected to the land and supports public access to the forest.
  2. Native and commercial forestry can work together. Income from commercial forestry helps pay for restoration, and restoration doesn’t stop forestry from making money.

Looking ahead

The goal is to let nature do the work. The creation of self-sustaining native ecosystems will support wildlife and people alike. By protecting native remnants and opening new corridors, ECAN is restoring Canterbury’s natural heritage, rākau i te rākau – one tree at a time.

More information

Visit ECAN's website.

Find out how regeneration or reversion of native forest works in the Emissions Trading Scheme.