Lichen!
A harmless and sometimes considered unslightly combination of algae or cyanobacteria and a fungus, coming together in a mutually beneficial relationship.
With a range of colours and forms, the presence of lichen on a tree is a sign of clean healthy air and that it has no negative impact on the growth of the tree.
An epiphyte (a plant or plant-like organism that grows on the surface of another plant), lichens are unlikely to kill a tree, or cause it to fail. Lichens are not parasitic and do not draw nutrients from the tree.
Lichens need sunlight for photosynthesis, so they don't thrive in heavy shade. Consequently, they are typically found on deciduous trees or trees that are already dying, as these conditions provide less leaf cover in the canopy, allowing more light to reach the lichens.
While it is normal and natural for lichen to be present on a tree, an abundance of lichen might suggest that the tree is experiencing some form of stress.
If you are concerned about the presence of lichen
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Some Choice News!
DOC is rolling out a new tool to help figure out what to tackle first when it comes to protecting our threatened species and the things putting them at risk.
Why does this matter? As Nikki Macdonald from The Post points out, we’re a country with around 4,400 threatened species. With limited time and funding, conservation has always meant making tough calls about what gets attention first.
For the first time, DOC has put real numbers around what it would take to do everything needed to properly safeguard our unique natural environment. The new BioInvest tool shows the scale of the challenge: 310,177 actions across 28,007 sites.
Now that we can see the full picture, it brings the big question into focus: how much do we, as Kiwis, truly value protecting nature — and what are we prepared to invest to make it happen?
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Cleaner required.
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paul@twentysevensteps.co.nz
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Once again, Resene and NZ Gardener are on the hunt for New Zealand’s best shed! Send in the photos and the stories behind your man caves, she sheds, clever upcycled spaces, potty potting sheds and colourful chicken coops. The Resene Shed of the Year 2026 winner receives $1000 Resene ColorShop voucher, a $908 large Vegepod Starter Pack and a one-year subscription to NZ Gardener. To enter, tell us in writing (no more than 500 words) why your garden shed is New Zealand’s best, and send up to five high-quality photos by email to mailbox@nzgardener.co.nz. Entries close February 23, 2026.
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