Help us in the ‘War on Weeds‘ by taking part in a new competition launched especially for Conservation Week. Come join the team and be in to win a prize!
Invasive weeds are destroying New Zealand’s unique native plant species.
This invasion is transforming the natural landscapes that make New Zealand special. They choke our forests and waterways, restrict habitat and kill native animals that depend on those habitats.

The rapid invasion of wilding pine
We currently manage 350 different types of weed, spending more than $10 million a year on control efforts.

Extreme weed control methods in Kahurangi National Park
The Dirty Dozen weeds are a handful of widespread and common weeds that can be easily identified. These weeds can be found in our own backyards, but they often jump the garden fence and escape into the surrounding environment.
Community action is needed if these weeds are to be brought under control.
For Conservation Week, we have launched the Dirty Dozen Competition. We encourage you to find and photograph the Dirty Dozen weeds and share them on NatureWatchNZ – an online community of nature watchers.
To enter, go outside and locate one of the Dirty Dozen weeds growing in your own backyard or in the wild. Simply load an observation of one of the Dirty Dozen weeds to this project during Conservation Week (10 – 18 September) to be in the draw for cool prizes.

Old man’s beard, another Dirty Dozen weed
We’re aiming to increase public awareness of the threat that weeds pose to our biodiversity. We want to get everyone familiar with identifying weeds in our own backyards!
Dirty Dozen competition – Minister of Conservation
Find our more about the Dirty Dozen competition on the DOC website.
Hey yeah let’s call ourselves DOC and environmental warriors and then spraying weedkillers like roundup around like water! As if there were no effects of this at all.
Weeds are a problem in this rural area but many farmers seem quite unconcerned. We have woolly nightshade beginning to come in and some others on the ‘dirty dozen’ list. Weeds sure do make for bad neighbours-it’s very difficult to get your neighbours to face up to their responsibilities when they seem so disinclined to actually DO anything!